Gaya APA

Tull, D, S., Hawkins, D, I. (1980). Marketing Research : Measurement and Method A Text with Cases (2nd. Ed). United States of America: Macmillan.

Gaya MLA

Tull, Donald, S., Hawkins, Del, I.. "Marketing Research : Measurement and Method A Text with Cases". 2nd. Ed United States of America: Macmillan, 1980. Text.