APA

Schwartz (Ronald L); Christiansen (Tom), . (1999). Learning Perl. : .

Chicago

Schwartz (Ronald L); Christiansen (Tom), . 1999. Learning Perl. : .

Harvard

Schwartz (Ronald L); Christiansen (Tom), . (1999). Learning Perl. : .

MLA

Schwartz (Ronald L); Christiansen (Tom), . Learning Perl. : . 1999.