Não informado. (1970). Annual fertilizer review. Food and Agriculture Organization of the United Nations.
Chicago-referens (17:e uppl.)Não informado. Annual Fertilizer Review. Rome: Food and Agriculture Organization of the United Nations, 1970.
MLA-referens (8:e uppl.)Não informado. Annual Fertilizer Review. Food and Agriculture Organization of the United Nations, 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.