TAWFIQ, F. N. The Vassal Class in the Era of the Crusades. Journal of Tikrit University for Humanities, [S. l.], v. 28, n. 1, p. 278–294, 2021. DOI: 10.25130/jtuh.28.1.2021.13. Disponível em: https://jtuh.org/index.php/jtuh/article/view/508. Acesso em: 25 sep. 2025.