Παραπομπή APA

Roberts, M. L. (1999). Direct marketing management (2nd ed.). Prentice-Hall of India.

Παραπομπή Chicago Style

Roberts, Mary Lou. Direct Marketing Management. 2nd ed. London: Prentice-Hall of India, 1999.

Παραπομπή MLA

Roberts, Mary Lou. Direct Marketing Management. 2nd ed. Prentice-Hall of India, 1999.