Added "Object-Oriented Programming in the BETA Programming Language"

free-programming-books.md

@@ -35,6 +35,7 @@
 * [Awk](#awk)
 * [Bash](#bash)
 * [Basic](#basic)
+* [BETA](#beta]
 * [C](#c)
 * [C++](#c-1)
 * [Clojure](#clojure)
@@ -513,6 +514,10 @@
 * [Visual Basic Essentials](http://www.techotopia.com/index.php/Visual_Basic_Essentials)
 
 
+###BETA
+* [Object-Oriented Programming in the BETA Programming Language](http://www.daimi.au.dk/~beta/Books/) - Ole Lehrmann Madsen, Birger Møller-Pedersen, Kristen Nygaard
+
+
 ###C
 * [A Tutorial on Pointers and Arrays in C](http://home.netcom.com/~tjensen/ptr/pointers.htm)
 * [Beej's Guide to C Programming](http://beej.us/guide/bgc/)