APA (7th ed.) Citation

Ellzey, R. S. (1987). Computer system software: The programmer/machine interface. Science Research Associates.

Chicago Style (17th ed.) Citation

Ellzey, Roy S. Computer System Software: The Programmer/machine Interface. Chicago, Ill.: Science Research Associates, 1987.

MLA (9th ed.) Citation

Ellzey, Roy S. Computer System Software: The Programmer/machine Interface. Science Research Associates, 1987.

Warning: These citations may not always be 100% accurate.