Não informado. (1970). Annual fertilizer review. Food and Agriculture Organization of the United Nations.
Chicago-Zitierstil (17. Ausg.)Não informado. Annual Fertilizer Review. Rome: Food and Agriculture Organization of the United Nations, 1970.
MLA-Zitierstil (8. Ausg.)Não informado. Annual Fertilizer Review. Food and Agriculture Organization of the United Nations, 1970.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.