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Through the years a great deal of literature concerning the study has been published in books, journals, and/or presented at conferences:
Ø Publications:
- a comprehensive listing of publications from 1969 to 1998
- many citations are linked to the abstract and full-text article online
 
Ø Presentations
- a listing of papers that have been presented at various conferences
Ø Working Papers
- a listing of papers that have been written to aid further research

Comments or questions? Please send them to curransr@ssc.upenn.edu.
©1997 University of Pennsylvania; Last Updated on June 3, 2003