Gaya APA
Business Information System. (1991).
United States america:
The Dryden Press.
Gaya Chicago
Business Information System.
2.
United States america:
The Dryden Press,
1991.
Text.
Gaya MLA
Business Information System.
2.
United States america:
The Dryden Press,
1991.
Text.
Gaya Turabian
Business Information System.
United States america:
The Dryden Press,
1991.
Print.