It’s not hard to find some books about Vatican II, but it can be difficult to do a comprehensive search. If you are looking in the University of Toronto Libraries catalog for books about a particular document, click on “Catalogue” and then on “Browse Search”. Then do a “Subject” search for “Vatican Council 2”. You will get an alphabetical list of subject headings. The sixteen documents of Vatican II are listed under their official titles (e.g. Constitutio dogmatica de Ecclesia), not under their common Latin titles (e.g. Lumen gentium).