Tappan, P. W. (1949). Juvenile delinquency. McGraw-Hill Book Co..
Lua i Stíl Chicago (17ú heag.)Tappan, Paul W. Juvenile Delinquency. New York: McGraw-Hill Book Co., 1949.
Lua MLA (9ú heag.)Tappan, Paul W. Juvenile Delinquency. McGraw-Hill Book Co., 1949.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.