Stang, Jamie; Story, Mary (2005). "Ch. 1. Adolescent Growth and Development"(PDF). In Stang J, Story M (ed.). Guidelines for Adolescent Nutrition Services. University of Minnesota. p. 3. Retrieved 26 November 2012.
Stang, Jamie; Story, Mary (2005). "Ch. 1. Adolescent Growth and Development"(PDF). In Stang J, Story M (ed.). Guidelines for Adolescent Nutrition Services. University of Minnesota. p. 3. Retrieved 26 November 2012.