APA (7th ed.) Citation

Collings, G. H. (1947). Commercial fertilizers: Their sources and use (4th ed.). [publisher not identified].

Chicago Style (17th ed.) Citation

Collings, Gilbeart H. Commercial Fertilizers: Their Sources and Use. 4th ed. Philadelphia: [publisher not identified], 1947.

MLA (9th ed.) Citation

Collings, Gilbeart H. Commercial Fertilizers: Their Sources and Use. 4th ed. [publisher not identified], 1947.

Warning: These citations may not always be 100% accurate.