Style de citation APA (7e éd.)

Keffer, C. A. (1907). Nature studies on the farm: Soils and plants. American Book Co..

Style de citation Chicago (17e éd.)

Keffer, Charles A. Nature Studies on the Farm: Soils and Plants. New York: American Book Co., 1907.

Style de citation MLA (8e éd.)

Keffer, Charles A. Nature Studies on the Farm: Soils and Plants. American Book Co., 1907.