APA (7 वां संस्करण) प्रशस्ति पत्र

Krugman, P. R., & Obstfeld, M. (1991). International economics: Theory and policy (2nd ed.). Harper Collins.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Krugman, Paul R., और Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. New York: Harper Collins, 1991.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Krugman, Paul R., और Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. Harper Collins, 1991.