Cita APA

United States. Department of agriculture. (1940). Farmers in a changing world, the yearbook of agriculture 1940.

Citación estilo Chicago

United States. Department of agriculture. Farmers in a Changing World, the Yearbook of Agriculture 1940. Washington, 1940.

Cita MLA

United States. Department of agriculture. Farmers in a Changing World, the Yearbook of Agriculture 1940. Washington, 1940.

Precaución: Estas citas no son 100% exactas.