This volume is a modern examination of the historical development of Sufism. The author offers a detailed account of the formation and development of the Sufi schools and orders (tariqahs) from the second century of Islam up until modern times. The work includes an extensive bibliography, notes, charts, and a glossary of Arabic terms. Professor John O. Voll provides an introduction and a list for further reading in this edition. The book is intended as a bibliographic resource for studies in Sufism and should find an audience among students, readers and scholars of Islamic studies. This book is intended for students of Islamic studies, Sufi studies, religion.