Tull, D. S., & Hawkins, D. I. (1993). Marketing research: Measurement & method (6th ed.). PHI Learning.
Čikaški stil citiranjaTull, Donald S., i Del I. Hawkins. Marketing Research: Measurement & Method. 6th ed. New Delhi: PHI Learning, 1993.
MLA način citiranjaTull, Donald S., i Del I. Hawkins. Marketing Research: Measurement & Method. 6th ed. PHI Learning, 1993.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.