Não informado. (1999). Topics in early childhood special education. Pro-Ed.
Chicago-referens (17:e uppl.)Não informado. Topics in Early Childhood Special Education. Austin, Tex: Pro-Ed, 1999.
MLA-referens (8:e uppl.)Não informado. Topics in Early Childhood Special Education. Pro-Ed, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.