Cita APA (7th ed.)

Collings, G. H. (2002). Commercial fertilizers: Their sources and use (4th ed.). Biotech Books.

Cita Chicago (17th ed.)

Collings, Gilbeart H. Commercial Fertilizers: Their Sources and Use. 4th ed. Delhi: Biotech Books, 2002.

Cita MLA (9th ed.)

Collings, Gilbeart H. Commercial Fertilizers: Their Sources and Use. 4th ed. Biotech Books, 2002.