PICKLE, L. W.; PEARSON, J. B.; CARR, D. B. micromapST: Exploring and Communicating Geospatial Patterns in US State Data. Journal of Statistical Software, [S. l.], v. 63, n. 3, p. 1–25, 2015. DOI: 10.18637/jss.v063.i03. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v063i03. Acesso em: 9 aug. 2022.