Gaya APA
Ries, A., Trout, J.
(2002).
Positioning : The Battle For Your Mind
(
1)
.
Jakarta:
Salemba Empat.
Gaya MLA
Ries, Al., Trout, Jack.
"Positioning : The Battle For Your Mind".
1
Jakarta:
Salemba Empat,
2002.
.