Here are 3 peer reviewed sources on the topic you could use :
“Presidentialism and Democracy in the Americas: The Role of the United States” by Scott Mainwaring and Matthew Soberg Shugart, Comparative Political Studies, vol. 29, no. 4 (July 1996)
“Presidential Versus Parliamentary Democracy: Implications for Political Stability and Economic Growth” by John A. Hall, Journal of Democracy, vol. 10, no. 2 (April 1999)
“The Presidentialization of Canadian Politics” by Paul J. Quirk, Canadian Journal of Political Science, vol. 37, no. 1 (March 2004)