http://www.eric.ed.gov/PDFS/ED396349.pdf

http://ci.nii.ac.jp/els/110007681582.pdf?id=ART0009494992&type=pdf&lang=en&host=cinii&order_no=&ppv_type=0&lang_sw=&no=1351172354&cp=

http://www.taltopia.com/articles/25001/Stand-up-Comedy-Top-Ten-Tips-for-Writing-Jokes-for-Your-Own-Act

http://www.youtube.com/watch?v=Ioz6S-YtH0s