Harold R Doughty. (1994). Guide to American graduate schools. New York: Penguin Books.
Trích dẫn kiểu ChicagoHarold R Doughty. Guide to American Graduate Schools. New York: Penguin Books, 1994.
MLA引文Harold R Doughty. Guide to American Graduate Schools. New York: Penguin Books, 1994.
警告：這些引文格式不一定是100％准確.