Citazione Stile APA (7a Edizione)

KOBS JIM. (1991). PROFITABLE DIRECT MARKETING (2.). NTC BUSINESS BOOKS.

Citazione stile Chigago Style (17a edizione)

KOBS JIM. PROFITABLE DIRECT MARKETING. 2. U S A: NTC BUSINESS BOOKS, 1991.

Citatione MLA (9a ed.)

KOBS JIM. PROFITABLE DIRECT MARKETING. 2. NTC BUSINESS BOOKS, 1991.