Gaya APA
Microsoft MS-DOS : user's and reference. (1991).
America:
Microsoft Corporation.
Gaya Chicago
Microsoft MS-DOS : user's and reference.
.
America:
Microsoft Corporation,
1991.
Text.
Gaya MLA
Microsoft MS-DOS : user's and reference.
.
America:
Microsoft Corporation,
1991.
Text.
Gaya Turabian
Microsoft MS-DOS : user's and reference.
America:
Microsoft Corporation,
1991.
Print.