Gaya APA

Tull, D, S., Hawkins, D, I. (1976). Marketing Research: Meaning, Measurement and Method (1). United States of America: THE Macmillan Company.

Gaya MLA

Tull, Donald, S.., Hawkins, Del, I.. "Marketing Research: Meaning, Measurement and Method". 1 United States of America: THE Macmillan Company, 1976. Text.