APA aipamena

COWELL DONALD W. (1984). MARKETING SERVICES. HEINEMANN.

Chicago Style aipamena

COWELL DONALD W. MARKETING SERVICES. LONDON: HEINEMANN, 1984.

MLA aipamena

COWELL DONALD W. MARKETING SERVICES. HEINEMANN, 1984.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.