APA (7e ed.) Bronvermelding

Davis, K. C. (1917). Productive farming (3d ed., rev. and enl.). J.B. Lippincott company.

Chicago (17e ed.) Bronvermelding

Davis, Kary Cadmus. Productive Farming. 3d ed., rev. and enl. Philadelphia and London: J.B. Lippincott company, 1917.

MLA (8e ed.) Bronvermelding

Davis, Kary Cadmus. Productive Farming. 3d ed., rev. and enl. J.B. Lippincott company, 1917.