Não informado. (1971). Irrigation Journal. Gold Trade Publishing.
Chicago (17e ed.) BronvermeldingNão informado. Irrigation Journal. Urbana, Ill: Gold Trade Publishing, 1971.
MLA (8e ed.) BronvermeldingNão informado. Irrigation Journal. Gold Trade Publishing, 1971.
Let op: Deze citaties zijn niet altijd 100% accuraat.