Ledesma, Chris (December 13, 2011). "Wrapping Up 2011". Simpsons Music 500. Archived from the original on January 8, 2012. Retrieved December 14, 2011.
Ledesma, Chris (December 13, 2011). "Wrapping Up 2011". Simpsons Music 500. Archived from the original on January 8, 2012. Retrieved December 14, 2011.