Duffy, J. P. (1994). How to earn a college degree without going to college (2nd ed.). Wiley.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDuffy, James P. How to Earn a College Degree Without Going to College. 2nd ed. New York: Wiley, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDuffy, James P. How to Earn a College Degree Without Going to College. 2nd ed. Wiley, 1994.
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