BASTO, M.; PEREIRA, J. . M. An SPSS R-Menu for Ordinal Factor Analysis. Journal of Statistical Software, [S. l.], v. 46, n. 4, p. 1–29, 2012. DOI: 10.18637/jss.v046.i04. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v046i04. Acesso em: 9 aug. 2022.