The preferred Canadian legal style is the Canadian Guide to Uniform Legal Citation, known as the ‘McGill Guide’. The Law Library has the latest edition of this (9th ed, 2018) in print at K 114 CANA. Link to catalogue record.
There is no free online full version. However, useful guides to using McGill style have been produced by:
For more information on guides to citation style, see the Law Library's Legal Citation Guides webpage.