Gaya APA
Management. (1983).
Boston:
Houghton Miffin Company.
Gaya Chicago
Management.
Ed.2.
Boston:
Houghton Miffin Company,
1983.
Text.
Gaya MLA
Management.
Ed.2.
Boston:
Houghton Miffin Company,
1983.
Text.
Gaya Turabian
Management.
Boston:
Houghton Miffin Company,
1983.
Print.