APA (7th ed.) Zitazioa

Edited by Estall, R. (1991). Global change and challenge: Geography for the 1990s. Routledge.

Chicago Style (17th ed.) Zitazioa

Edited by Estall, Robert. Global Change and Challenge: Geography for the 1990s. London: Routledge, 1991.

MLA (9th ed.) Zitazioa

Edited by Estall, Robert. Global Change and Challenge: Geography for the 1990s. Routledge, 1991.