Dyfyniad APA

Crosby, A. W. (1972). The Columbian exchange: Biological and cultural consequences of 1492. Greenwood.

Dyfyniad Arddull Chicago

Crosby, Alfred W. The Columbian Exchange: Biological and Cultural Consequences of 1492. Westport: Greenwood, 1972.

Dyfyniad MLA

Crosby, Alfred W. The Columbian Exchange: Biological and Cultural Consequences of 1492. Greenwood, 1972.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.