APA (7th ed.) Citation

Safari Tech Books Online, Peek, J. D. A., Strang, J. C., & Todino, G. C. (1998). Learning the UNIX operating system (Fourth edition.). O'Reilly.

Chicago Style (17th ed.) Citation

Safari Tech Books Online, Jerry D Author Peek, John Contributor Strang, and Grace Contributor Todino. Learning the UNIX Operating System. Fourth edition. [Place of publication not identified]: O'Reilly, 1998.

MLA (9th ed.) Citation

Safari Tech Books Online, et al. Learning the UNIX Operating System. Fourth edition. O'Reilly, 1998.