Secondary legal resources include textbooks, treatises, legal commentary, law journals, news & analysis, legal dictionaries & encyclopedias, as well as government documents.
Canadian Labour Arbitration, Fifth Edition by 
Collective agreement arbitration in Canada, 6th ed. by 
Labour arbitration in Canada, 2nd ed. by 
Willis & Winkler on Leading Labour Cases by These are good (published) sources for news and analysis of Canadian employment and labour law.