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