"This analysis is based on school-level data reported by principals participating in the school year 2003-04 School Survey on Crime and Safety (SSOCS)"--Page [1].
"NCES 2007-010."
Includes bibliographical references (page 3).
Also available via Internet from NCES web site. Address as of 11/29/07: http://nces.ed.gov/pubs2007/2007010.pdf; current access available via PURL.