Gaya APA
Williams, B, K., O'Leary, T, J. (1989).
Computers And Information Systems .
California:
The Benjamin/Cummings Publishing Company.
Gaya MLA
Williams, Brian, K.., O'Leary, T., J..
"Computers And Information Systems".
California:
The Benjamin/Cummings Publishing Company,
1989.
Text.