If you want to know more, you can refer to moxibustion in Xie Xiliang and warm moxibustion in Ma Shaoqun. Yes, moxibustion rope, or small China moxibustion therapy.
There are many moxibustion books on the market now, but today's works are not enough to read and the level is not good. The books recommended above are basically good books.
If you want to study moxibustion in depth, you might as well study ancient books. Ancient works include Vernacular Edition of Moxibustion (edited by China Institute of Moxibustion), Shenjiu Jinglun, Bian Que Heart Jing, Acupuncture Breeding Jing, Emergency Moxibustion and so on.