Idriz, M. “Ahmad Yasawī As a Leading Early Central Asian Sūfī: Reexamination of His Perceptions on Tariqah (Order)”. Afkar: Jurnal Akidah Dan Pemikiran Islam, vol. 9, no. 1, June 2008, pp. 39-50, http://adum.um.edu.my/index.php/afkar/article/view/5871.