Cita APA (7a ed.)

Collings, G. H. (1947). Commercial fertilizers (4a. ed.). The Blakiston Company.

Cita Chicago Style (17a ed.)

Collings, Gilbert H. Commercial Fertilizers. 4a. ed. Philadelphia: The Blakiston Company, 1947.

Cita MLA (9a ed.)

Collings, Gilbert H. Commercial Fertilizers. 4a. ed. The Blakiston Company, 1947.