Gaya APA
Philip, K., Gary, A. (1994).
Principles of marketing / Philip Kotler, Gary Armstrong (Ed.ke-6).
New Jersey:
Prentice-Hall.
Gaya MLA
Kotler, Philip., Armstrong, Gary.
"Principles of marketing / Philip Kotler, Gary Armstrong".
Ed.ke-6
New Jersey:
Prentice-Hall,
1994.
Skripsi.