Não informado. (1971). Early Child Development and Care. Gordon and Breach Science Publishers.
Chicago-referens (17:e uppl.)Não informado. Early Child Development and Care. London: Gordon and Breach Science Publishers, 1971.
MLA-referens (8:e uppl.)Não informado. Early Child Development and Care. Gordon and Breach Science Publishers, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.