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
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Collective agreement arbitration in Canada, 6th ed.
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Labour arbitration in Canada, 2nd ed.
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Willis & Winkler on Leading Labour Cases
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These are good (published) sources for news and analysis of Canadian employment and labour law.