VALERO-MORA, P. M. ggplot2: Elegant Graphics for Data Analysis. Journal of Statistical Software, Book Reviews, [S. l.], v. 35, n. 1, p. 1–3, 2010. DOI: 10.18637/jss.v035.b01. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v035b01. Acesso em: 27 apr. 2024.