APA (7e ed.) Bronvermelding

Não informado. Extension bulletin. Oregon Agricultural College Extension Service.

Chicago (17e ed.) Bronvermelding

Não informado. Extension Bulletin. Corvallis, Ore: Oregon Agricultural College Extension Service.

MLA (8e ed.) Bronvermelding

Não informado. Extension Bulletin. Oregon Agricultural College Extension Service.

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