APA (7e ed.) Bronvermelding

Não informado. Science in agriculture. Pennsylvania Agricultural Experiment Station.

Chicago (17e ed.) Bronvermelding

Não informado. Science in Agriculture. University Park, Pa: Pennsylvania Agricultural Experiment Station.

MLA (8e ed.) Bronvermelding

Não informado. Science in Agriculture. Pennsylvania Agricultural Experiment Station.

Let op: Deze citaties zijn niet altijd 100% accuraat.