Gustafson, A. (1997). Hand book of fertilizers: Their sources, makeup, effects and use. ABP.
Lua i Stíl Chicago (17ú heag.)Gustafson, A.F. Hand Book of Fertilizers: Their Sources, Makeup, Effects and Use. New Delhi: ABP, 1997.
Lua MLA (9ú heag.)Gustafson, A.F. Hand Book of Fertilizers: Their Sources, Makeup, Effects and Use. ABP, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.