Gustafson, A. (1997). Hand book of fertilizers: Their sources, makeup, effects and use. ABP.
Chicago-referens (17:e uppl.)Gustafson, A.F. Hand Book of Fertilizers: Their Sources, Makeup, Effects and Use. New Delhi: ABP, 1997.
MLA-referens (9:e uppl.)Gustafson, A.F. Hand Book of Fertilizers: Their Sources, Makeup, Effects and Use. ABP, 1997.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.