Cita APA

Colby, C. (1957). Soil savers: The work of the soil conservation service of the United States. Coward-McCann.

Citación estilo Chicago

Colby, C.B. Soil Savers: The Work of the Soil Conservation Service of the United States. New York: Coward-McCann, 1957.

Cita MLA

Colby, C.B. Soil Savers: The Work of the Soil Conservation Service of the United States. New York: Coward-McCann, 1957.