Consider the law of other jurisdictions
If you have not found what you need after conducting a thorough review of Canadian law, you may have to turn to the law of other jurisdictions.
Although the research resources will be different in those jurisdictions, the basic research methodology will be similar to the methodology you have already employed in your Canadian research.
Fox, Rosalie, “Using Citation Analysis to determine the use of information sources from the European Union by Judges of the Supreme Court of Canada” (2008) Journées Européennes d’Informatique Juridique.
McCormick, Peter, “American Citations and the McLachlin Court: An Empirical Study” (2009) 47 Osgoode Hall Law Journal 83.