APA استشهاد

Krugman, P. R. a. O. (2005). International Economics: Theory and Policy (6.).

استشهاد بنمط شيكاغو

Krugman, Paul R and Obstfeld. International Economics: Theory and Policy. 6. Pearson Education, New Delhi, 2005.

MLA استشهاد

Krugman, Paul R and Obstfeld. International Economics: Theory and Policy. 6. 2005.