BI 12 (2nd ed., 1989)
Author : Farīd ad-Dīn ʿAṭṭār
Editors : Edited by Hellmut Ritter
Helmut Ritter was a German scholar and Expert of Islamic theology and mysticism.
2nd edition, Teheran, 1989
439 pp.
Link to the website with an option to download the book