Παραπομπή APA

Tull, D. S. (1993). Marketing research (6th ed.). Prentice Hall.

Παραπομπή Chicago Style

Tull, Donald S. Marketing Research. 6th ed. New Delhi: Prentice Hall, 1993.

Παραπομπή MLA

Tull, Donald S. Marketing Research. 6th ed. Prentice Hall, 1993.