BRAY, Marc; ZHANG, Wei. Cross-Border Shadow Education: Private Supplementary Tutoring in the Global Education Industry. Revista Española de Educación Comparada, [S. l.], n. 42, p. 28–43, 2022. DOI: 10.5944/reec.42.2023.34275. Disponível em: https://revistas.uned.es/index.php/REEC/article/view/34275. Acesso em: 27 ene. 2026.