Cita APA (7th ed.)

Gray, H. P. (1973). The balance of payments costs of international travel. Centre D' Etudes du Tourisme.

Cita Chicago (17th ed.)

Gray, H Peter. The Balance of Payments Costs of International Travel. Aix-En-Provence: Centre D' Etudes du Tourisme, 1973.

Cita MLA (9th ed.)

Gray, H Peter. The Balance of Payments Costs of International Travel. Centre D' Etudes du Tourisme, 1973.