Paquette, Jerry. “Educational Attainment and Employment Income: Incentives and Disincentives for Staying in School”. Canadian Journal of Education Revue Canadienne De l’éducation, vol. 24, no. 2, June 1999, pp. 151–168, https://journals.sfu.ca/cje/index.php/cje-rce/article/view/2750.