APA-referens (7:e uppl.)

Tull, D. (1993). Marketing Research. Prentice Hall of India.

Chicago-referens (17:e uppl.)

Tull, Donald. Marketing Research. New Delhi: Prentice Hall of India, 1993.

MLA-referens (9:e uppl.)

Tull, Donald. Marketing Research. Prentice Hall of India, 1993.