APA (7e ed.) Bronvermelding

ROLLER, D. (1989). How To Make Big Money In Multilevel Marketing. Prentice-Hall.

Chicago (17e ed.) Bronvermelding

ROLLER, David. How To Make Big Money In Multilevel Marketing. Prentice-Hall, 1989.

MLA (8e ed.) Bronvermelding

ROLLER, David. How To Make Big Money In Multilevel Marketing. Prentice-Hall, 1989.

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