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Written by Taru Medha
Universities usually ask for up to three academic references for PhD applications. These can be from your Masters supervisor, academic staff or an employer. References give an impression of you as a potential PhD researcher whilst both reinforcing your personal statement and academic history, and adding more.
It can be tempting to overlook references as you focus on the parts of a PhD application that require more direct input from you, but to do so would be a mistake. References are as important to your PhD application as your personal statement, research proposal and academic history. They can not only strengthen your application by supporting the information you provide but they can also make up for any potential weaknesses in your academic profile.
On this page, I’ve explained how reference letters for PhD applications work, with advice on choosing referees and requesting references from them.
Applying for doctoral study can be competitive and universities often receive a substantial number of submissions. As a result, they are not able to meet every applicant in person.
A PhD reference letter should:
The information provided by your referees could also help corroborate other aspects of your application, or inform some of the questions at your interview.
Choosing who to ask for a reference can however be a very daunting experience. But there are ways to make it easier!
Choosing the right referees for you and your project is an important part of the application process. Referees that you might consider are:
Academics usually have strong networks within their fields. This means there is a good chance that your referee will be known to your potential supervisor (and vice versa).
Selecting a referee who works in your subject area can therefore be a good way of signalling that your research has a place within a specific field.
When choosing referees you should think about who can offer a knowledgeable and personal understanding of your goals, interests and abilities as a researcher.
A reference is as much (if not more) about why and how you research as it is about what you research.
Your referees are important, but so are other elements of your PhD application. Our guides cover personal statements, research proposals, eligibility criteria and more.
Don’t leave your referee with a surprise reference request in their inbox. Make contact with them (by email, phone, or in person) before submitting your application and let them know that you would like to put them down as a referee.
Most academics will empathise with someone looking to pursue their interests through postgraduate study and will be willing to write a reference.
However, busy schedules inevitably mean missed or forgotten emails or a lack of hours in the day to write your reference at short notice. This isn’t just about etiquette; it is also about giving your referees enough time to do you justice.
There are a few things you can do to make life easier for your referees - and help them produce a better reference for you.
Even if you know your referees well, you should arrange to meet with them in person. This will allow you to discuss why you want to pursue your research to doctorate level and what your goals are.
This will give them a good sense of your motivations for studying for a PhD and you may also find it helpful to articulate to another academic your reasons for pursuing a doctorate.
Likewise, if using an employer as a referee is appropriate for your study, talk to them about why you want to transition from employment to postgraduate research. This can be particularly valuable if an employer isn't immediately familiar with your academic subject or the details of PhD study.
If you are approaching academic staff who may not know you or your research very well, help them to write you a strong reference by offering them a sample of some your best written work and your personal statement.
Above all else, don't underestimate the importance of references to the rest of your PhD application.
Whoever you choose - and however you approach them - your references will help to demonstrate to a selection panel that you have the skills, tenacity, and knowledge to pursue your research through PhD study.
Think carefully and choose the right referees for you and your project, give them plenty of time and help them to write you the best possible reference by providing a clear picture of yourself as a researcher.
I know it can feel daunting to ask your professors to take time out of their busy schedules for you. But as I’ve mentioned in this guide, most will understand—after all, they’ve likely been in the same position themselves—and will usually be glad to support you with a reference. That said, it’s important not to take their help for granted.
If you know your referees well, consider starting with an informal chat. Let them know when you’re planning to apply, so they’ll be aware to expect any emails from the university. This is exactly what I did when applying for my Masters, and the process for PhD applications isn’t all that different.
Also, make sure you check the reference guidelines for each university. Many simply ask for your referees’ email addresses and contact them directly. But if a signed letter is required instead, arrange this well in advance so there are no last-minute surprises.
Ask at least 4–6 weeks before the deadline. Academics are busy and strong letters take time to write. The earlier you ask, the better.
Don’t take it personally. Some professors may feel they don’t know you well enough to write a strong letter. It’s better to have a strong, supportive referee than a lukewarm one. It’s ok to ask someone else, but don’t forget to thank them in any case.
Often yes, especially if your applications are within the same field. However, if you’re applying to different disciplines, you may want to ask different referees who can highlight relevant skills for each.
That’s no problem. Academics often move institutions. They can still provide a reference as long as they can comment on your work. Just be sure to give their current email and details.
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Taru MedhaTaru joined FindAPhD as a Content Writer in 2022. She creates well-researched, thorough content for our guides and blogs, as well as short video content for our social profiles. She has a Bachelors degree in Journalism and Mass Communication from Bennett University in India and completed a Masters degree in Global Journalism from the University of Sheffield in 2021, giving her personal experience with postgraduate study as an international student.

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