Boyko, John (November 10, 2022), "Opposition Party in Canada", The Canadian Encyclopedia, Historica Canada, archived from the original on March 9, 2023, retrieved March 9, 2023
Boyko, John (November 10, 2022), "Opposition Party in Canada", The Canadian Encyclopedia, Historica Canada, archived from the original on March 9, 2023, retrieved March 9, 2023