APA

Keller L. S., . (1988). Operating systems: communicating with and controlling the computer. New York: Prentice Hall.

Chicago

Keller Laurie S, . 1988. Operating systems: communicating with and controlling the computer. New York: Prentice Hall.

Harvard

Keller L. S., . (1988). Operating systems: communicating with and controlling the computer. New York: Prentice Hall.

MLA

Keller Laurie S, . Operating systems: communicating with and controlling the computer. New York: Prentice Hall. 1988.