diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 6af5d155d..deb971f26 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -2574,6 +2574,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Unix as IDE](https://github.com/mrzool/unix-as-ide) - Tom Ryder (epub, mobi)
 * [UNIX Commands and Concepts](http://www.cs.bu.edu/teaching/unix/reference/) - Robert I. Pitts
 * [Unix for Poets](http://web.stanford.edu/class/cs124/kwc-unix-for-poets.pdf) - Kenneth Ward Church (PDF)
+* [Unix Programming Tools](http://cslibrary.stanford.edu/107/UnixProgrammingTools.pdf) - Parlante, Zelenski (PDF)
 * [Unix Toolbox](https://web.archive.org/web/20210912091852/https://cb.vu/unixtoolbox.xhtml) - Colin Barschel *(:card_file_box: archived)*
 * [UNIX Tutorial for Beginners](http://www.ee.surrey.ac.uk/Teaching/Unix/)