Update free-programming-books.md

free-programming-books.md

@@ -1316,6 +1316,7 @@ See also [TeX](#tex)
 * [MATLAB Succinctly, Syncfusion](http://www.syncfusion.com/resources/techportal/ebooks/matlab) (PDF, Kindle) *(Just fill the fields with any values)*
 * [Numerical Computing with MATLAB](http://www.mathworks.com/moler/index_ncm.html)
 * [Physical Modeling in MATLAB](http://greenteapress.com/matlab/index.html) - Alan B. Downey
+* [An Interactive Introduction to MATLAB](http://www.science.smith.edu/~jcardell/Courses/EGR326/Intro-to-MATLAB.pdf)
 
 
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