The Persian mystics : the invocations of Sheikh Ābdullāh Ansarī of Herat, A.D. 1005-1090 / by Jogendra Singh. Jogendra Singh Jogendra Singh, Sir, 1877- Mysticism Islam. 297.4 JOP New York, E.P. Dutton, 1939. 1939. 1939 Text 59 p. ; eng eng per Wisdom of the East series Wisdom of the East series.