Duffy, J. P. (1994). How to earn a college degree without going to college (2nd ed.). Wiley.
Chicago-referens (17:e uppl.)Duffy, James P. How to Earn a College Degree Without Going to College. 2nd ed. New York: Wiley, 1994.
MLA-referens (9:e uppl.)Duffy, James P. How to Earn a College Degree Without Going to College. 2nd ed. Wiley, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.