Não informado. (1967). Early Childhood Education. Alberta Teachers Association.
Chicago-referens (17:e uppl.)Não informado. Early Childhood Education. Edmonton, Canada: Alberta Teachers Association, 1967.
MLA-referens (8:e uppl.)Não informado. Early Childhood Education. Alberta Teachers Association, 1967.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.