APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.