National Conference on Parole Washington, D.C., & Bell, M. (1957). Parole in principle and practice. National Probation and Parole Association.
Chicago-referens (17:e uppl.)National Conference on Parole Washington, D.C., och Marjorie Bell. Parole in Principle and Practice. New York: National Probation and Parole Association, 1957.
MLA-referens (8:e uppl.)National Conference on Parole Washington, D.C., och Marjorie Bell. Parole in Principle and Practice. National Probation and Parole Association, 1957.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.