Não informado. (2000). Bulletin. Minnesota Agricultural Experiment Station.
Chicago (17e ed.) BronvermeldingNão informado. Bulletin. Saint Paul, Minn: Minnesota Agricultural Experiment Station, 2000.
MLA (8e ed.) BronvermeldingNão informado. Bulletin. Minnesota Agricultural Experiment Station, 2000.
Let op: Deze citaties zijn niet altijd 100% accuraat.