Books by Nancy Ritter:
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Ritter, Nancy, ed.: Changing Course: Preventing Gang Membership (Washington: US Dept. of Justice and US Dept. of Health and Human Services, 2013), also ed. by Thomas R. Simon and Reshma R. Mahendra (multiple formats at nij.gov)
Additional books by Nancy Ritter in the extended shelves:
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Ritter, Nancy: Missing persons and unidentified remains : the nation's silent mass disaster. (U.S. Dept. of Justice, Office of Justice Programs, 2007), also by Glenn R. Schmitt, Lauren R. Taylor, Jake Horowitz, United States. Office of Justice Programs, and National Institute of Justice (U.S.) (page images at HathiTrust)
Find more by Nancy Ritter at your library, or elsewhere.