SORGE, B. .; FELDHAUS, C. . A Multilevel Analysis of Persistence of Students Taking a Pre-Engineering Curriculum in High School. International Journal of Learning, Teaching and Educational Research, [S. l.], v. 18, n. 12, p. 417–431, 2019. Disponível em: http://ijlter.net/index.php/ijlter/article/view/390. Acesso em: 4 jul. 2026.