APA (7e ed.) Bronvermelding

Não informado. Leaflet. Purdue University, Agricultural Extension Service.

Chicago (17e ed.) Bronvermelding

Não informado. Leaflet. Lafayette, Ind: Purdue University, Agricultural Extension Service.

MLA (8e ed.) Bronvermelding

Não informado. Leaflet. Purdue University, Agricultural Extension Service.

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