Sufism Today
Sheikh Abdullah did not write a book, as he said his murids were his book – his teachings live on in their hearts.
Although he left Sheikh Abdul Aziz as his Mevlevi successor, he didn’t leave a Naqshbandi Sheikh as a successor.
The following links provide further information about Naqshbandi Sufism:
Shaykh Hisham Website
Shaykh Muhammad Adil Facebook
Sufi Spirit Website
Shaykh Muhammad Adil.