APA (7th ed.) Zitazioa

Gregory, D. (1989). Horizons in human geography. Macmillan.

Chicago Style (17th ed.) Zitazioa

Gregory, Derek. Horizons in Human Geography. London: Macmillan, 1989.

MLA (9th ed.) Zitazioa

Gregory, Derek. Horizons in Human Geography. Macmillan, 1989.