A good place to begin your research on class actions is in a text. Some leading texts are listed on this page for your convenience.
To find a full listing of books on your topic, search the library catalogue under the subject heading "Class Actions".
Winkler, Warren K. et al., The Law of Class Actions in Canada (Canada Law Book, 2014). KF 8896 W55 2014 / 2nd floor Practice Collection.
Williston and Rolls Court Forms, 3rd ed., loose-leaf. (LexisNexis, 1986-). KF 8836 W54 2017 / 2nd floor Practice Collection; also available on Lexis+™ Canada in the library.