Não informado. (1969). Ontario education. Ontario Public School Trustees Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Ontario Education. Toronto, Canada: Ontario Public School Trustees Association, 1969.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Ontario Education. Ontario Public School Trustees Association, 1969.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.