Alaeddin Tekin. “RESTORATION OF RIAU SULTANATE-OTTOMAN RELATIONS (1857-1904):: Explanatory Factors”. Al-Shajarah: Journal of the International Institute of Islamic Thought and Civilization (ISTAC) 26, no. 2 (December 29, 2021): 177–196. Accessed May 2, 2024. https://journals.iium.edu.my/shajarah/index.php/shaj/article/view/1307.