Thomas, Lewis H. (2016) [1982]. "Riel, Louis (1844-85)". Dictionary of Canadian Biography. Vol. 11. University of Toronto / Université Laval. Retrieved January 14, 2022.
Swainson, Donald (1990). "Campbell, Sir Alexander". Dictionary of Canadian Biography. Vol. 12. University of Toronto / Université Laval. Retrieved January 16, 2022. As Justice Minister Campbell thus had a hand in decision related to trial in Regina instead of Manitoba with Anglophone-only jury of six leading to political backlash.
Thomas, Lewis Herbert (1977). "A Judicial Murder – The Trial of Louis Riel". In Howard Palmer (ed.). The Settlement of the West. 7th Western Canadian Studies Conf. Calgary: Comprint Publishing / U. of Calgary. pp. 37–59.. According to Barkwell, Dorion & Préfontaine (2001), "Thomas delineates the federal government's repeated efforts to ensure Riel’s execution."
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Thomas, Lewis Herbert (1977). "A Judicial Murder – The Trial of Louis Riel". In Howard Palmer (ed.). The Settlement of the West. 7th Western Canadian Studies Conf. Calgary: Comprint Publishing / U. of Calgary. pp. 37–59.. According to Barkwell, Dorion & Préfontaine (2001), "Thomas delineates the federal government's repeated efforts to ensure Riel’s execution."