BOAYO, S. M. H. ’Islam’ and the Decline of Civilization: Deconstruction of Historiosophy of Oswald Spengler and Henri Pierenne. Al-Shajarah: Journal of the International Institute of Islamic Thought and Civilization (ISTAC), [S. l.], v. 12, n. 1, 2014. DOI: 10.31436/shajarah.v12i1.63. Disponível em: https://journals.iium.edu.my/shajarah/index.php/shaj/article/view/63. Acesso em: 6 may. 2024.