Gaya APA

Tull, D, S., I., I, H, D. (1980). Marketing research measurement and method a text with cases . New York: New York: Macmillan; 1980.

Gaya MLA

Tull, Donald, S.., I., I., Hawkins,, Del. "Marketing research measurement and method a text with cases". New York: New York: Macmillan; 1980, 1980. Text.