Muthoifin, Muthoifin, and Putri Dwi Lestari. 2022. “The Concept of the Soul (Tazkiyatun Nafs) and Its Influence in the View of the Qur’an Surah Al-Shams”. Prosiding University Research Colloquium, July, 141-52. https://repository.urecol.org/index.php/proceeding/article/view/1983.