APA (7th ed.) Citation

Schwartz, R. L., & Christiansen, T. (1997). Learning Perl (2nd ed.). O'Reilly.

Chicago Style (17th ed.) Citation

Schwartz, Randal L., and Tom Christiansen. Learning Perl. 2nd ed. Sebastopol, California: O'Reilly, 1997.

MLA (9th ed.) Citation

Schwartz, Randal L., and Tom Christiansen. Learning Perl. 2nd ed. O'Reilly, 1997.