PICCIANO, Anthony G.; SEAMAN, Jeff. K–12 ONLINE LEARNING: A SURVEY OF U.S. SCHOOL DISTRICT ADMINISTRATORS. Online Learning, Boston, MA, v. 11, n. 3, 2019. DOI: 10.24059/olj.v11i3.1719. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/1719. Acesso em: 15 apr. 2026.