* [http://www.thecanadianencyclopedia.com/index.cfm?PgNm=TCESubjects&Params=A1 ''Canadian Encyclopedia'' (2008)] reliable detailed encyclopedia, on-line free | * [http://www.thecanadianencyclopedia.com/index.cfm?PgNm=TCESubjects&Params=A1 ''Canadian Encyclopedia'' (2008)] reliable detailed encyclopedia, on-line free |