APA (7e ed.) Bronvermelding

COREY E R. (1985). PROBLEMS IN MARKETING (6TH.). MCGRAW-HILL.

Chicago (17e ed.) Bronvermelding

COREY E R. PROBLEMS IN MARKETING. 6TH. NEW YORK: MCGRAW-HILL, 1985.

MLA (9e ed.) Bronvermelding

COREY E R. PROBLEMS IN MARKETING. 6TH. MCGRAW-HILL, 1985.