The books below are no longer in print and are made available for those who would like to read about Sufism in the Farsi language.
Both books are written by Dr. Javad Nurbakhsh, the previous Master of the Nimatullahi Sufi Order
In The Paradise Of The Sufis (در بهشت صو فیان)
In The Tavern of Ruin (درخرابات)