APA (7th ed.) Citation

Christiansen, T., Wall, L., Foy, B. D., Oram, A., & Romano, R. (2012). Programming Perl (Fourth edition.). O'Reilly.

Chicago Style (17th ed.) Citation

Christiansen, Tom, Larry Wall, Brian D. Foy, Andrew Oram, and Robert Romano. Programming Perl. Fourth edition. Beijing ; Sebastopol: O'Reilly, 2012.

MLA (9th ed.) Citation

Christiansen, Tom, et al. Programming Perl. Fourth edition. O'Reilly, 2012.