Cita APA (7a ed.)

Schwartz, R. L., & Christiansen, T. (1997). Learning Perl (2nd ed.). [S.n.].

Cita Chicago Style (17a ed.)

Schwartz, Randal L., y Tom Christiansen. Learning Perl. 2nd ed. Sebastopol: [S.n.], 1997.

Cita MLA (9a ed.)

Schwartz, Randal L., y Tom Christiansen. Learning Perl. 2nd ed. [S.n.], 1997.