Ontario Secondary School Teachers' Federation. (1988). Education forum: The magazine for secondary school professionals. Ontario Secondary School Teachers' Federation.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Ontario Secondary School Teachers' Federation. Education Forum: The Magazine for Secondary School Professionals. [Toronto: Ontario Secondary School Teachers' Federation, 1988.
MLA -ийн эшлэл (9 дэх хэвлэлт)Ontario Secondary School Teachers' Federation. Education Forum: The Magazine for Secondary School Professionals. Ontario Secondary School Teachers' Federation, 1988.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.