Cita APA (7a ed.)

Dunlop, S., & MacDonald, D. (1981). North America: A new geography (1. publ.). Heinemann Educational Books Ltd.

Cita Chicago Style (17a ed.)

Dunlop, Stewart, y Donald MacDonald. North America: A New Geography. 1. publ. London [u.a.]: Heinemann Educational Books Ltd, 1981.

Cita MLA (9a ed.)

Dunlop, Stewart, y Donald MacDonald. North America: A New Geography. 1. publ. Heinemann Educational Books Ltd, 1981.