Gaya APA
Kotler, Philip, Armstrong, Gary. (1989).
Principles of marketing (4th.ed.).
Englewood Cliffs:
Prentice Hall.
Gaya Chicago
Kotler, Philip, Armstrong, Gary.
Principles of marketing.
4th.ed.
Englewood Cliffs:
Prentice Hall,
1989.
Text.
Gaya MLA
Kotler, Philip, Armstrong, Gary.
Principles of marketing.
4th.ed.
Englewood Cliffs:
Prentice Hall,
1989.
Text.
Gaya Turabian
Kotler, Philip, Armstrong, Gary.
Principles of marketing.
4th.ed.
Englewood Cliffs:
Prentice Hall,
1989.
Print.