Não informado. (1969). Ontario education. Ontario Public School Trustees Association.
Chicago-referens (17:e uppl.)Não informado. Ontario Education. Toronto, Canada: Ontario Public School Trustees Association, 1969.
MLA-referens (8:e uppl.)Não informado. Ontario Education. Ontario Public School Trustees Association, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.