Gaya APA

O'leary, T, J., Williams, B, K. (1989). Computers and Information Systems (Second Edition). California: The Benjamin/Cummings Publishing Company, Inc..

Gaya MLA

O'leary, T.imothy, J.., Williams, Brian, K.. "Computers and Information Systems". Second Edition California: The Benjamin/Cummings Publishing Company, Inc., 1989. .