Dyfyniad APA

Atwood, W. W. (1940). The physiographic provinces of North America. Ginn and company.

Dyfyniad Arddull Chicago

Atwood, Wallace Walter. The Physiographic Provinces of North America. Boston: Ginn and company, 1940.

Dyfyniad MLA

Atwood, Wallace Walter. The Physiographic Provinces of North America. Ginn and company, 1940.

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