Não informado. (1974). History and social science teacher. Ontario History and Social Science Teachers Association.
Chicago-referens (17:e uppl.)Não informado. History and Social Science Teacher. Toronto, Canada: Ontario History and Social Science Teachers Association, 1974.
MLA-referens (8:e uppl.)Não informado. History and Social Science Teacher. Ontario History and Social Science Teachers Association, 1974.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.