HELMREICH, J. E.; PRUZEK, R. M. PSAgraphics: An R Package to Support Propensity Score Analysis. Journal of Statistical Software, [S. l.], v. 29, n. 6, p. 1–23, 2009. DOI: 10.18637/jss.v029.i06. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v029i06. Acesso em: 13 apr. 2024.