Tull, D. S., & Hawkins, D. I. (1993). Marketing research: Measurement & method : a text with cases (6th ed.). Prentice-Hall.
Citazione stile Chigago Style (17a edizione)Tull, Donald S., e Del I. Hawkins. Marketing Research: Measurement & Method : A Text with Cases. 6th ed. New Delhi: Prentice-Hall, 1993.
Citatione MLA (9a ed.)Tull, Donald S., e Del I. Hawkins. Marketing Research: Measurement & Method : A Text with Cases. 6th ed. Prentice-Hall, 1993.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.