Gaya APA
Management. (1992).
United State:
Addison-Wesley.
Gaya Chicago
Management.
Ed.6.
United State:
Addison-Wesley,
1992.
.
Gaya MLA
Management.
Ed.6.
United State:
Addison-Wesley,
1992.
.
Gaya Turabian
Management.
United State:
Addison-Wesley,
1992.
.