Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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