Dr. Marilyn Daniels' research at Pennsylvania State University
http://www.psu.edu/ur/2001/signlanguage.html
Dr. Kimberly Whaley's research at Ohio State University
http://www.newswise.com/articles/view/?id=SIGNLANG.OSU
Dr. Rachel Mayberry's research at McGill University in Toronto
http://www.cbc.ca/stories/2002/05/01/lang_learn020501