Gaiser, Adam (2010). "The Ibāḍī "stages of religion" re-examined: Tracing the history of the Masālik al-Dīn". Bulletin of the School of Oriental and African Studies, University of London. 73 (2): 216. doi:10.1017/S0041977X10000054. JSTOR25703020.
Al-Salmi, Abdulrahman (2001) The Omani siyar as a literary genre and its role in the political evolution and doctrinal development of Eastern Ibadism, with special reference to the epistles of Khwarizm, Khurasan and Mansura, Durham theses, Durham University. Available at Durham E-Theses Online: http://etheses.dur.ac.uk/1001/
jstor.org
Gaiser, Adam (2010). "The Ibāḍī "stages of religion" re-examined: Tracing the history of the Masālik al-Dīn". Bulletin of the School of Oriental and African Studies, University of London. 73 (2): 216. doi:10.1017/S0041977X10000054. JSTOR25703020.