Cyclical comparison of succession of civilizations by Ibn Khaldun and Spingler. Raparin Journal of Humanities (RJH), [S. l.], v. 11, n. 2, p. 874–891, 2024. DOI: 10.26750/Vol(11).No(2).Paper35. Disponível em: https://journal.uor.edu.krd/index.php/JUR/article/view/1258. Acesso em: 14 jan. 2026.