Não informado. (1969). Ontario education. Ontario Public School Trustees Association.
Chicago-Zitierstil (17. Ausg.)Não informado. Ontario Education. Toronto, Canada: Ontario Public School Trustees Association, 1969.
MLA-Zitierstil (8. Ausg.)Não informado. Ontario Education. Ontario Public School Trustees Association, 1969.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.