Update TODO.md

Author: aalhour

TODO.md

@@ -66,20 +66,24 @@
 
 ### References:
 
-* MIT's Introduction to Algorithms:
- * [MIT OCW](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-006-introduction-to-algorithms-fall-2011/)
- * [Youtube](https://www.youtube.com/playlist?list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb).
- * [CSAIL](http://courses.csail.mit.edu/6.006/fall11/notes.shtml).
-* MIT's Advanced Data Structures Course:
- * [CSAIL](https://courses.csail.mit.edu/6.851/).
- * [MIT OCW](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-851-advanced-data-structures-spring-2012/).
- * [Youtube](https://www.youtube.com/playlist?list=PLUl4u3cNGP61hsJNdULdudlRL493b-XZf).
-* MIT's Design and Analysis of Algorithms Course:
- * [Stellar Site](http://stellar.mit.edu/S/course/6/sp15/6.046J/materials.html)
- * [MIT OCW](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-046j-design-and-analysis-of-algorithms-spring-2012/).
- * [Youtube](https://www.youtube.com/playlist?list=PL8B24C31197EC371C)
-* [List of Algorithms, Wikipedia](https://en.wikipedia.org/wiki/List_of_algorithms).
-* [List of Data Structures, Wikipedia](https://en.wikipedia.org/wiki/List_of_data_structures).
-* GeeksForGeeks:
- * [Algorithms](http://www.geeksforgeeks.org/fundamentals-of-algorithms/)
- * [Data Structures](http://www.geeksforgeeks.org/data-structures/#AdvancedDataStructure)
+ * MIT's Introduction to Algorithms (6.006):
+   + [MIT OCW](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-006-introduction-to-algorithms-fall-2011/)
+   + [Youtube](https://www.youtube.com/playlist?list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb).
+   + [CSAIL](http://courses.csail.mit.edu/6.006/fall11/notes.shtml).
+ * MIT's Advanced Data Structures Course (6.851):
+   + [CSAIL](https://courses.csail.mit.edu/6.851/).
+   + [MIT OCW](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-851-advanced-data-structures-spring-2012/).
+   + [Youtube](https://www.youtube.com/playlist?list=PLUl4u3cNGP61hsJNdULdudlRL493b-XZf).
+ * MIT's Design and Analysis of Algorithms Course (6.046J):
+   + 2012:
+     * [MIT OCW](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-046j-design-and-analysis-of-algorithms-spring-2012/).
+     * [Youtube](https://www.youtube.com/playlist?list=PL8B24C31197EC371C).
+   + 2015:
+     * [Stellar Site](http://stellar.mit.edu/S/course/6/sp15/6.046J/materials.html).
+     * [MIT OCW](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-046j-design-and-analysis-of-algorithms-spring-2015/).
+     * [Youtube](https://www.youtube.com/playlist?list=PLUl4u3cNGP6317WaSNfmCvGym2ucw3oGp).
+ * [List of Algorithms, Wikipedia](https://en.wikipedia.org/wiki/List_of_algorithms).
+ * [List of Data Structures, Wikipedia](https://en.wikipedia.org/wiki/List_of_data_structures).
+ * GeeksForGeeks:
+   + [Algorithms](http://www.geeksforgeeks.org/fundamentals-of-algorithms/).
+   + [Data Structures](http://www.geeksforgeeks.org/data-structures/#AdvancedDataStructure).