APA引文

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引文

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