Mohamed Meerasahibu, D.M. 2021. Some Early Definitions of Taṣawwuf: Exploring the Centrality of Abū Yazīd al-Bisṭāmi in Its History. Afkar: Jurnal Akidah dan Pemikiran Islam. 23, 1 (Jun. 2021), 197–250. DOI:https://doi.org/10.22452/afkar.vol23no1.6.