APA (7e ed.) Bronvermelding

Smith, J. R. (1929). Tree crops: A permanent agriculture. Harcourt, Brace.

Chicago (17e ed.) Bronvermelding

Smith, J. Russell. Tree Crops: A Permanent Agriculture. New York: Harcourt, Brace, 1929.

MLA (9e ed.) Bronvermelding

Smith, J. Russell. Tree Crops: A Permanent Agriculture. Harcourt, Brace, 1929.