Some jurisdictions publish guides for employers on compliance with WHMIS requirements, including those for labels. Here are links to some of those guides:
FEDERAL:
The Employer and the Workplace Hazardous Materials Information System
ALBERTA:
WHMIS—Information for Employers
BRITISH COLUMBIA:
WHMIS Core Material, Chapter 4—The Label
MANITOBA:
WHMIS Guide
NOVA SCOTIA:
Interpretation Guide to Nova Scotia’s WHMIS Regulations
ONTARIO:
Workplace Hazardous Materials Information System (WHMIS): A Guide to the Legislation