BURKHALTER, Anne D. Effects of Environmental and Instructional Factors on Student Motivation and Self-Directed Learning. Journal of the American Academy of Special Education Professionals, [S. l.], v. 9, n. 2, p. 166–180, 2014. DOI: 10.64546/jaasep.247. Disponível em: https://www.aasep.org/article/view/247. Acesso em: 23 sep. 2025.