Syahnan, Mhd., Asrul Asrul, and Ja’far Ja’far. 2019. “The Intellectual Network of Mandailing and Haramayn Muslim Scholars in the Mid-19th and Early 20th Centuries”. Teosofi: Jurnal Tasawuf Dan Pemikiran Islam 9 (2):257-81. https://doi.org/10.15642/teosofi.2019.9.2.257-281.