Cita APA (7a ed.)

Walsh, N. (1999). Learning Perl/TK. O'Reilly.

Cita Chicago Style (17a ed.)

Walsh, Nancy. Learning Perl/TK. Beijing: O'Reilly, 1999.

Cita MLA (9a ed.)

Walsh, Nancy. Learning Perl/TK. O'Reilly, 1999.