Teixeira, W., and N. Aquino Menezes-Filho. “Estimating the Return to Education Considerate the Legislation of Education in Brazil As an Instrumental Variable”. Brazilian Journal of Political Economy, vol. 32, no. 3, July 2012, pp. 479-96, https://centrodeeconomiapolitica.org/repojs/index.php/journal/article/view/365.