Gaya APA
Walker, D.W.. (1989).
Computer based information systems; an introduction .
:
Pergamon Press.
Gaya Chicago
Walker, D.W..
Computer based information systems; an introduction.
:
Pergamon Press,
1989.
Text.
Gaya MLA
Walker, D.W..
Computer based information systems; an introduction.
:
Pergamon Press,
1989.
Text.
Gaya Turabian
Walker, D.W..
Computer based information systems; an introduction.
:
Pergamon Press,
1989.
Print.