Não informado. (1958). Crops and soils. American Society of Agronomy.
Chicago (17e ed.) BronvermeldingNão informado. Crops and Soils. Madison, Wis: American Society of Agronomy, 1958.
MLA (8e ed.) BronvermeldingNão informado. Crops and Soils. American Society of Agronomy, 1958.
Let op: Deze citaties zijn niet altijd 100% accuraat.