https://www.linuxnotes.net/perlcd/index.htm
Don’t you love free online books.
Contains:
Perl in a Nutshell, by Ellen Siever, Stephen Spainhour & Nathan Patwardhan
Programming Perl, 3rd Edition, by Larry Wall, Tom Christiansen & Jon Orwant
Advanced Perl Programming, by Sriram Srinivasan
Perl Cookbook, by Tom Christiansen and Nathan Torkington
Perl for System Administration, by David N. Blank-Edelman