ZEILEIS, A.; UMLAUF, N.; LEISCH, F. Flexible Generation of E-Learning Exams in R: Moodle Quizzes, OLAT Assessments, and Beyond. Journal of Statistical Software, [S. l.], v. 58, n. 1, p. 1–36, 2014. DOI: 10.18637/jss.v058.i01. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v058i01. Acesso em: 8 aug. 2022.