upenn reference

organization.md

@@ -84,6 +84,8 @@ The grading is the standard grading scale:
 
 * Haskell:
  * https://haskell.org/documentation/
+ * Lecture: [Introduction to Haskell](https://www.cis.upenn.edu/~cis1940/spring13/) - including
+ lecutre notes and nice homework exercises
  * [Creating types](http://learnyouahaskell.com/making-our-own-types-and-typeclasses)
  * [Pattern matching](https://www.haskell.org/tutorial/patterns.html)
  * [Modules](https://www.haskell.org/tutorial/modules.html)