Não informado. (1969). International Journal of Early Childhood. World Organization for Early Childwood Education.
Chicago-referens (17:e uppl.)Não informado. International Journal of Early Childhood. Dublin: World Organization for Early Childwood Education, 1969.
MLA-referens (8:e uppl.)Não informado. International Journal of Early Childhood. World Organization for Early Childwood Education, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.