Cita APA (7th ed.)

KATZENSTEIN HERBERT. (1992). DIRECT MARKETING (2.). MAXWELL MACMILLAN PUBLICATION LTD.

Cita Chicago (17th ed.)

KATZENSTEIN HERBERT. DIRECT MARKETING. 2. NEW YORK: MAXWELL MACMILLAN PUBLICATION LTD, 1992.

Cita MLA (9th ed.)

KATZENSTEIN HERBERT. DIRECT MARKETING. 2. MAXWELL MACMILLAN PUBLICATION LTD, 1992.