Ferraz, D., & Oliveira, F. C. R. de. (2017). Impact of the National Professional Qualification Program (PNQ) on Income: An Econometric Analysis in Piracicaba/SP-Brazil. Pesquisa &Amp; Debate Revista Do Programa De Pós-Graduação Em Economia Política, 28(2(52), pg. 105–123. Recuperado de https://revistas.pucsp.br/index.php/rpe/article/view/34838