Não informado. (1967). Phosphorus in agriculture. International Superphosphate and Compound Manufacturers Association.
Chicago-Zitierstil (17. Ausg.)Não informado. Phosphorus in Agriculture. London: International Superphosphate and Compound Manufacturers Association, 1967.
MLA-Zitierstil (8. Ausg.)Não informado. Phosphorus in Agriculture. International Superphosphate and Compound Manufacturers Association, 1967.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.