APA-viite (7. p.)

Krugman , P. R. (2017). International Economics: Theory and Policy (8th.). Pearson Education.

Chicago-viite (17. p.)

Krugman , Paul R. International Economics: Theory and Policy. 8th. Chennai: Pearson Education, 2017.

MLA-viite (9. p.)

Krugman , Paul R. International Economics: Theory and Policy. 8th. Pearson Education, 2017.