Gaya APA
GRAY, P. et al (1989).
MANAGEMENT OF INFORMATION SYSTEM (2 ND ED. (INTERNATIONAL EDITION)).
USA:
THE DRYDEN PRESS.
Gaya MLA
GRAY, PAUL. et al.
"MANAGEMENT OF INFORMATION SYSTEM".
2 ND ED. (INTERNATIONAL EDITION)
USA:
THE DRYDEN PRESS,
1989.
Textbook.