APA (7e ed.) Bronvermelding
Collings, G. H. (1947). Commercial Fertilizers: Their sources and use. Blakiston.
Chicago (17e ed.) Bronvermelding
Collings, Gilbeart Hooper. Commercial Fertilizers: Their Sources and Use. Philadelphia, Toronto: Blakiston, 1947.
MLA (9e ed.) Bronvermelding
Collings, Gilbeart Hooper. Commercial Fertilizers: Their Sources and Use. Blakiston, 1947.
Let op: Deze citaties zijn niet altijd 100% accuraat.