by translated, introduced, and annotated by William C. Chittick.
by Frithjof Schuon and William Stoddart.
by Seyyed Hossein Hasr.
by Frithjof Schuon, ʻIsa Nur ad Din Ahmad and D.M. Matheson.
by Frithjof Schuon and Nur ad Din Ahmad, Shaykh Isa.
by R.A. Nicholsen.
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