APA (7th ed.) Citation

Poole, P. C., & Poole, N. (1989). Using UNIX by example (Repr.). Addison-Wesley.

Chicago Style (17th ed.) Citation

Poole, P. C., and N. Poole. Using UNIX by Example. Repr. Sydney u.a: Addison-Wesley, 1989.

MLA (9th ed.) Citation

Poole, P. C., and N. Poole. Using UNIX by Example. Repr. Addison-Wesley, 1989.