Não informado. (1973). Day Care and Early Education. Human Sciences Press.
Chicago-referens (17:e uppl.)Não informado. Day Care and Early Education. New York: Human Sciences Press, 1973.
MLA-referens (8:e uppl.)Não informado. Day Care and Early Education. Human Sciences Press, 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.