Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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