Gaya APA

Parker, J., Vahaly, J. (1993). Study Guide to Accompany: Principles of Microeconomics (Fifth Edition). New York: HarperCollins Publisher.

Gaya MLA

Parker, Jeffrey., Vahaly, John. "Study Guide to Accompany: Principles of Microeconomics". Fifth Edition New York: HarperCollins Publisher, 1993. Text.