Harold R Doughty. (1994). Guide to American graduate schools. New York: Penguin Books.
Chicago Style aipamenaHarold R Doughty. Guide to American Graduate Schools. New York: Penguin Books, 1994.
MLA aipamenaHarold R Doughty. Guide to American Graduate Schools. New York: Penguin Books, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.