APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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