Gray, H. P. (1987). International economics: Problems and policies. Brooks/Cole Publishing.
Cita Chicago (17th ed.)Gray, H. Peter. International Economics: Problems and Policies. Montery, Calif.: Brooks/Cole Publishing, 1987.
Cita MLA (9th ed.)Gray, H. Peter. International Economics: Problems and Policies. Brooks/Cole Publishing, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.