Cita APA (7th ed.)

O'Sullivan, P. E. (1981). Geographical economics. Macmillan.

Cita Chicago (17th ed.)

O'Sullivan, Patrick Edmund. Geographical Economics. New York: Macmillan, 1981.

Cita MLA (9th ed.)

O'Sullivan, Patrick Edmund. Geographical Economics. Macmillan, 1981.