Nicholson, Reynold A. The Kashf Al-Mahjub the oldest Persian treatise on Sufiism / [Book] : Reynold A. Nicholson, Ali B. Uthman Al-Jullabi Al-Hujwiri. - 2nd & New ed. - Lahore : Islamic Book Service, ?1997. - xx, 441 p. Index. All. ISBN: 96980285522 (hardback) Subjects--Topical Terms: Sufism--Prayers and devotions.Sufism. Dewey Class. No.: 297.4382