Gaya APA
Tull, D, S., Hawkins, D.
(s.a).
Marketing Research : Measurement & Method
(
edisi 5)
.
S.l:
S.n.
Gaya MLA
Tull, Donald, S., Hawkins, Del.
"Marketing Research : Measurement & Method".
edisi 5
S.l:
S.n,
s.a.
Text.