APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (8. p.)

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