APA (7e ed.) Bronvermelding

FERBER ROBERT EDT. (1974). HANDBOOK OF MARKETING RESEARCH. MCGRAW-HILL.

Chicago (17e ed.) Bronvermelding

FERBER ROBERT EDT. HANDBOOK OF MARKETING RESEARCH. NEW YORK: MCGRAW-HILL, 1974.

MLA (9e ed.) Bronvermelding

FERBER ROBERT EDT. HANDBOOK OF MARKETING RESEARCH. MCGRAW-HILL, 1974.