APA (7th ed.) Citation

Wall, L., Schwartz, R. L., & Christiansen, T. (1999). Programming Perl (2nd ed.). O'Reilly.

Chicago Style (17th ed.) Citation

Wall, Larry, Randal L. Schwartz, and Tom Christiansen. Programming Perl. 2nd ed. [Sebastopol, Calif.]: O'Reilly, 1999.

MLA (9th ed.) Citation

Wall, Larry, et al. Programming Perl. 2nd ed. O'Reilly, 1999.