Cita APA

(1938). Soils and men: Yearbook of agriculture 1938. United States: United States Government Printing Office.

Citación estilo Chicago

Soils and Men: Yearbook of Agriculture 1938. United States: United States Government Printing Office, 1938.

Cita MLA

Soils and Men: Yearbook of Agriculture 1938. United States: United States Government Printing Office, 1938.

Precaución: Estas citas no son 100% exactas.