Παραπομπή APA

Tul,Donald S, & Hawkins,Del I. Marketing research: Measurement and method (2nd ed.). Collier Macmillan International.

Παραπομπή Chicago Style

Tul,Donald S, και Hawkins,Del I. Marketing Research: Measurement and Method. 2nd ed. New York: Collier Macmillan International.

Παραπομπή MLA

Tul,Donald S, και Hawkins,Del I. Marketing Research: Measurement and Method. 2nd ed. Collier Macmillan International.