Shah, Idries. Neglected aspects of Sufi study : on the nature of Sufi knowledge / Idries Shah. - London : Octagon Press, c 1989. - 71 p. ; 19 cm. 330 330 ISBN: 0 900860 56 1 Subjects--Topical Terms: Sufism. Dewey Class. No.: 297.4 / S524n