Canadian Guide to Uniform Legal Citation (McGill Guide), 10th ed.
See 3.15 of the McGill Guide - "Administrative Bodies and Tribunals"
If the decision is from a printed reporter, follow 3.15.1. You will see it follows the pattern for court cases. The main difference is its guidance on how to render the style of cause and how to handle tribunal abbreviations.
If the decision is online, follow 3.15.2.
See 3.17 of the McGill Guide - "Arbitration Cases"
As the section notes, the rules are the same as for jurisprudence, but there is guidance on what to include if there is no style of cause, what type of identifier is needed if there is no reporter, and the need to include the name of the arbitrator if possible.
See 7.4.2 of the McGill Guide - "Foreign Sources - United States - Jurisprudence"
This section gives the general form and explains differences in citing cases from federal and state courts.
See 7.1.1 - "Foreign Sources - Common Law Jurisdictions - Jurisprudence"
Guidance on citing UK cases, as a foreign common law jurisdiction provides that many elements will be the same as with Canadian case citations. However, be sure to read through the section for guidance specific to the UK, such as how to locate neutral citations for older cases and when to cite cases to a printed reporter.