Cita APA (7th ed.)

Gale Group & Warf, B. (2006). Encyclopedia of human geography. Sage Publications.

Cita Chicago (17th ed.)

Gale Group i Barney Warf. Encyclopedia of Human Geography. Thousand Oaks, Calif: Sage Publications, 2006.

Cita MLA (9th ed.)

Gale Group i Barney Warf. Encyclopedia of Human Geography. Sage Publications, 2006.