I am writing a historical, non-fiction book. Two of the individuals of importance in my book both graduated from the same medical school in the early 1800's. The school happens to still exist today. I knew they attended but didn't know when they graduated. So I sent an email to the library at the Medical School and they replied to my email and listed each man's graduation date.
So since this was communication between myself and the school, how should I probably cite my source for the information on the individuals graduation dates?
So since this was communication between myself and the school, how should I probably cite my source for the information on the individuals graduation dates?