Halim, H., Yusoff, K., Ahmad, S., Faizal Abdul Khir, M., Hafiz Abdullah, A., Hamzah, S., Suraya Aziz, H., Sholeh Saad, S., & Ebrahimi, M. (2018). Analysis on Social Change among Bulghar Society Based on Risalah Ibn Fadlan 922 AD. International Journal of Engineering and Technology, 7(3.25), 501-504. https://doi.org/10.14419/ijet.v7i3.25.17739