APA (7th ed.) Zitazioa

Grigg, D. (1992). An Introduction to agricultural geography. Routledge.

Chicago Style (17th ed.) Zitazioa

Grigg, David. An Introduction to Agricultural Geography. London: Routledge, 1992.

MLA (9th ed.) Zitazioa

Grigg, David. An Introduction to Agricultural Geography. Routledge, 1992.