I am in the process of applying for a Ph.D. and the application process requires several reference letters. Since I only have done significant work with only one supervisor so far in my Master's, I would need to ask from previous professors during my Bachelor's.
Fortunately, the previous professors have already written me reference letters, and therefore the effort would be minimal. What would need to be done is just translate and then maybe change a few words to match the description of the ad.
Nevertheless, I cannot help but feel bad about reconnecting with previous professors with more than two years of no communication, only to ask for a reference letter and to get their permission to list them as referees in my CV.
What is your take on this? How should I approach this without being seen in a bad way?