Your referees have to upload their letters of reference in pdf format.
Doc or Email or a simple pdf without the official letterhead will not be accepted.
It is necessary that the letters of reference need to show the letterhead of the corresponding institution, and preferably should be signed.
If your referees live in a country without regular internet access or if they have technical problems, they are allowed to send pdfs or postal letters to the GEAS Application team.
Postal letters will not be accepted after the application date, as you will not be able to submit your application without both letters having been uploaded.