Cita APA (7a ed.)

Whitehead, G. (1985). Commerce: Made simple (11th ed.). Heinemann.

Cita Chicago Style (17a ed.)

Whitehead, Geoffrey. Commerce: Made Simple. 11th ed. Great Britain: Heinemann, 1985.

Cita MLA (8a ed.)

Whitehead, Geoffrey. Commerce: Made Simple. 11th ed. Heinemann, 1985.