APA (7e ed.) Bronvermelding

Não informado. Extension circular. Nebraska Agricultural Experiment Station.

Chicago (17e ed.) Bronvermelding

Não informado. Extension Circular. Lincoln, Neb: Nebraska Agricultural Experiment Station.

MLA (8e ed.) Bronvermelding

Não informado. Extension Circular. Nebraska Agricultural Experiment Station.

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