Burckhardt, Titus. Introduction to Sufi doctrine / Titus Burckhardt ; foreword by William C. Chittick. - Bloomíngton : World Wisdom, 2008. - xv, 118 páginas - Library of perennial philosophy. Spiritual classics series. . Includes bibliographical references and index. ISBN: 9781933316505 1933316500 LCCN: 2008002905 Subjects--Topical Terms: Sofismo--Doctrinas Dewey Class. No.: 297.41 B948i