Cita APA (7a ed.)

Roberts, M. L., & Berger, P. D. (1999). Direct marketing management (2nd ed.). Prentice Hall.

Cita Chicago Style (17a ed.)

Roberts, Mary Lou, y Paul D. Berger. Direct Marketing Management. 2nd ed. Upper Saddle River, N.J: Prentice Hall, 1999.

Cita MLA (9a ed.)

Roberts, Mary Lou, y Paul D. Berger. Direct Marketing Management. 2nd ed. Prentice Hall, 1999.