APA (7th ed.) Citation

Schwartz, R. L. (1993). Learning Perl. O'Reilly.

Chicago Style (17th ed.) Citation

Schwartz, Randal L. Learning Perl. Sebastopol, Calif: O'Reilly, 1993.

MLA (9th ed.) Citation

Schwartz, Randal L. Learning Perl. O'Reilly, 1993.