APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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