APA (7th ed.) Citation

Collings, G. H. (1947). Commercial fertilizers: Their sources and use (4. ed.). Blakiston Co.

Chicago Style (17th ed.) Citation

Collings, Gilbeart H. Commercial Fertilizers: Their Sources and Use. 4. ed. Philadelphia: Blakiston Co, 1947.

MLA (9th ed.) Citation

Collings, Gilbeart H. Commercial Fertilizers: Their Sources and Use. 4. ed. Blakiston Co, 1947.