APA (7e ed.) Bronvermelding

Duffy, P. (1994). Business to Business marketing. Vision.

Chicago (17e ed.) Bronvermelding

Duffy, Philip. Business to Business Marketing. Delhi: Vision, 1994.

MLA (9e ed.) Bronvermelding

Duffy, Philip. Business to Business Marketing. Vision, 1994.

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