Audio lessons are by Abu Talhah rahimahullaah, mainly based upon Imam AbdurRahman Al-Sadi’s explanation, which can be bought here and used as study aid while listening to the series. In addition, Dawud Burbank rahimahullaah also explains some Points from Shaykh Uthaymeen and other Imaams as well.
Click on the Links below to Download Mp3 from Abdurrahman.org
https://abdurrahman.org/2017/07/01/kitaab-ut-tawheed-book-study-audio-series/
From the Archive:
https://archive.org/details/Kitaab-ut-Tawheed-Dawud-Burbank