APA Style

Krugman, P, R. et al (2013). International Economics: Theory and Policy (Pearson Horizon Edition) (9th (Pearson Horizon Editions)). Boston: Pearson Education.

MLA Style

Krugman, Paul, R.. et al. "International Economics: Theory and Policy (Pearson Horizon Edition)". 9th (Pearson Horizon Editions) Boston: Pearson Education, 2013. Text.