Gaya APA
TULL, D, S., Hawkins, D, L. (1980).
MARKETING RESEARCH : Measurement and method (2).
United States:
MACMILLAN PUBLISHING COMPANY.
Gaya MLA
TULL, Donald, S.., Hawkins, Del, L..
"MARKETING RESEARCH : Measurement and method".
2
United States:
MACMILLAN PUBLISHING COMPANY,
1980.
Text.