APA (7th ed.) Citation

Thomas, R. (1985). A user guide to the UNIX system (2nd ed.). National Book Store.

Chicago Style (17th ed.) Citation

Thomas, Rebecca. A User Guide to the UNIX System. 2nd ed. Manila: National Book Store, 1985.

MLA (9th ed.) Citation

Thomas, Rebecca. A User Guide to the UNIX System. 2nd ed. National Book Store, 1985.