Halim H, Yusoff K, Ahmad S, Faizal Abdul Khir M, Hafiz Abdullah A, Hamzah S, et al. Analysis on social change among Bulghar society based on Risalah Ibn Fadlan 922 AD. IJET [Internet]. 2018 Oct. 2 [cited 2024 Dec. 22];7(4.9):190-3. Available from: https://sciencepubco.com/index.php/ijet/article/view/20671