Gaya APA
Professional Ethics. (1981).
California:
Wadsworth Publishing Company.
Gaya Chicago
Professional Ethics.
.
California:
Wadsworth Publishing Company,
1981.
Text.
Gaya MLA
Professional Ethics.
.
California:
Wadsworth Publishing Company,
1981.
Text.
Gaya Turabian
Professional Ethics.
California:
Wadsworth Publishing Company,
1981.
Print.