Cita APA

ebrary, Inc, Silbereisen, R. K., & Lerner, R. M. (2007). Approaches to positive youth development. Sage Publications.

Citación estilo Chicago

ebrary, Inc, R. K. Silbereisen, and Richard M. Lerner. Approaches to Positive Youth Development. Los Angeles: Sage Publications, 2007.

Cita MLA

ebrary, Inc, et al. Approaches to Positive Youth Development. Sage Publications, 2007.