APA (7th ed.) Zitazioa

Maps.com (Firm) & ebrary, Inc. (1999). The spread of agriculture. Maps.com.

Chicago Style (17th ed.) Zitazioa

Maps.com (Firm) eta Inc ebrary. The Spread of Agriculture. [S.l.]: Maps.com, 1999.

MLA (9th ed.) Zitazioa

Maps.com (Firm) eta Inc ebrary. The Spread of Agriculture. Maps.com, 1999.