- https://pragprog.com/book/swperl/modern-perl-fourth-edition
- https://web.archive.org/web/20161123122456/http://www.modernperlbooks.com/
- http://www.modernperlbooks.com – as of today (and also in its archived version shown above) this web page announces the 2016 (AKA “4e”) edition
- http://www.modernperlbooks.com/books/modern_perl_2016/ – online HTML version
- http://onyxneon.com/books/modern_perl – which version to get where (PDF/letter, PDF/A4, …)