POOLE, K.; LEWIS, J. B.; LO, J.; CARROLL, R. Scaling Roll Call Votes with wnominate in R. Journal of Statistical Software, [S. l.], v. 42, n. 14, p. 1–21, 2011. DOI: 10.18637/jss.v042.i14. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v042i14. Acesso em: 28 nov. 2021.