Cita APA (7th ed.)

National Conference on Parole Washington, D.C., & Bell, M. (1957). Parole in principle and practice. National Probation and Parole Association.

Cita Chicago (17th ed.)

National Conference on Parole Washington, D.C., i Marjorie Bell. Parole in Principle and Practice. New York: National Probation and Parole Association, 1957.

Cita MLA (8th ed.)

National Conference on Parole Washington, D.C., i Marjorie Bell. Parole in Principle and Practice. National Probation and Parole Association, 1957.