APA (7th ed.) Citation

National Probation Association (U.S.). (1929). Year book. The National Probation Association.

Chicago Style (17th ed.) Citation

National Probation Association (U.S.). Year Book. New York, N. Y.: The National Probation Association, 1929.

MLA (9th ed.) Citation

National Probation Association (U.S.). Year Book. The National Probation Association, 1929.