Gaya APA
User's guide and reference. (1991).
USA:
Microsoft Corporation.
Gaya Chicago
User's guide and reference.
.
USA:
Microsoft Corporation,
1991.
Text.
Gaya MLA
User's guide and reference.
.
USA:
Microsoft Corporation,
1991.
Text.
Gaya Turabian
User's guide and reference.
USA:
Microsoft Corporation,
1991.
Print.