APA (7th ed.) Citation

Schwartz, R. L., Foy, B. D., & Phoenix, T. (2016). Learning Perl : making easy things easy and hard things possible / Randal L. Schwartz, Brian D. Foy, and Tom Phoenix: Making easy things easy and hard things possible (Seventh edition.). O'Reilly.

Chicago Style (17th ed.) Citation

Schwartz, Randal L., Brian D. Foy, and Tom Phoenix. Learning Perl : Making Easy Things Easy and Hard Things Possible / Randal L. Schwartz, Brian D. Foy, and Tom Phoenix: Making Easy Things Easy and Hard Things Possible. Seventh edition. Beijing: O'Reilly, 2016.

MLA (9th ed.) Citation

Schwartz, Randal L., et al. Learning Perl : Making Easy Things Easy and Hard Things Possible / Randal L. Schwartz, Brian D. Foy, and Tom Phoenix: Making Easy Things Easy and Hard Things Possible. Seventh edition. O'Reilly, 2016.

Warning: These citations may not always be 100% accurate.