diff --git a/free-programming-books.md b/free-programming-books.md
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--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -922,6 +922,7 @@
 ###LaTeX
 * [The Not So Short Introduction to LaTeX](http://tobi.oetiker.ch/lshort/lshort.pdf) (PDF)
 * [LaTeX Wikibook](http://en.wikibooks.org/wiki/LaTeX)
+* [Arbirtrary LaTex Reference](http://latex.knobs-dials.com/)
 
 See also [TeX](#tex)