* [Linux Shell Scripting With Bash](https://archive.org/download/B-001-002-839/LinuxShellScriptingWithBash-Sams.pdf) - Ken O. Burtch (PDF) *(:card_file_box: archived)*
* [Slackbook (2005)](http://slackbook.org) - Alan Hicks, Chris Lumens, David Cantrell, Logan Johnson (HTML, DocBook, Postscript, PDF)