Não informado. (1948). Young children. National Association for the Education of Young Children.
Chicago-referens (17:e uppl.)Não informado. Young Children. Washington: National Association for the Education of Young Children, 1948.
MLA-referens (8:e uppl.)Não informado. Young Children. National Association for the Education of Young Children, 1948.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.