ebrary, Inc, Silbereisen, R. K., & Lerner, R. M. (2007). Approaches to positive youth development. Sage Publications.
Lua i Stíl Chicago (17ú heag.)ebrary, Inc, R. K. Silbereisen, agus Richard M. Lerner. Approaches to Positive Youth Development. Los Angeles: Sage Publications, 2007.
Lua MLA (9ú heag.)ebrary, Inc, et al. Approaches to Positive Youth Development. Sage Publications, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.