Gaya APA
Information System. (2005).
:
COURSE Tcnology.
Gaya Chicago
Information System.
Pertama.
:
COURSE Tcnology,
2005.
Text.
Gaya MLA
Information System.
Pertama.
:
COURSE Tcnology,
2005.
Text.
Gaya Turabian
Information System.
:
COURSE Tcnology,
2005.
Print.