Ramón Guerrero, Rafael. “Mysthycal Doctrine of Abû Bakr Al-Kalâbâdî. Introduction and First Chapter”. Anaquel de Estudios Árabes 21 (August 30, 2010): 141–152. Accessed July 23, 2026. https://revistas.ucm.es/index.php/ANQE/article/view/ANQE1010110141A.