From the Government of Canada: "The only official study guide for the citizenship test is Discover Canada: The Rights and Responsibilities of Citizenship, available from Citizenship and Immigration Canada at no cost. If you have applied for citizenship and are preparing for the citizenship test, your primary resource should be the official study guide. If you use any other material to prepare for the citizenship test, you do so at your own risk."
Government of Canada. Official study guide. This page share different formats for the study guide. You can read it online, download and print out a copy, ask for a copy to be mailed to you, or listen to the study guide being read.