Contains the keyword Comparative religion

Guénon, R. (2001).  Insights into Islamic esoterism and Taoism. (Fohr, Henry D., Fohr, Samuel D., Ed.).Insights into Islamic esoterism and Taoism. 87.
Izutsu, T. (2004).  Sufismo y taoísmo. Vol. 1: Ibn ʿArabī. 2a ed. Sufismo y taoísmo. Vol. 1: Ibn ʿArabī. 2a ed. 339.