APA (7th ed.) Citation

Doughty, H. (1990). Guide to American graduate schools (6th ed., completely rev.). Penguin Books.

Chicago Style (17th ed.) Citation

Doughty, Harold. Guide to American Graduate Schools. 6th ed., completely rev. New York, N.Y.: Penguin Books, 1990.

MLA (9th ed.) Citation

Doughty, Harold. Guide to American Graduate Schools. 6th ed., completely rev. Penguin Books, 1990.