Cita APA (7a ed.)

Heck, H. (1972). International trade: A management guide. American Management Association.

Cita Chicago Style (17a ed.)

Heck, Harold. International Trade: A Management Guide. New York: American Management Association, 1972.

Cita MLA (9a ed.)

Heck, Harold. International Trade: A Management Guide. American Management Association, 1972.