There are hundreds of books on the Dzogchen available to an avid practitioner.
Having received empowerment into the Dzogchen or Ati Yoga practice and oral transmission and pointing out instructions, certain texts can contribute:
Yeshe Lama
https://www.shambhala.com/yeshe-lama.html
Supreme Wisdom: A Commentary on Yeshe Lama
https://www.padmasambhava.org/chiso/books-by-khenpo-rinpoches/supreme-wisdom-a-commentary-on-yeshe-lama/
The Yeshe Lama: Jigme Lingpa’s Dzogchen Atiyoga Manual
https://www.amazon.com/Yeshe-Lama-Lingpas-Dzogchen-Atiyoga-ebook/dp/B06XXSHBKD/
Considering that I
Here are books available to the general public:
https://www.amazon.com/s?i=stripbooks&rh=p_27%3AChogyal+Namkhai+Norbu
And restricted material for those that have been initiated by Namkhai Norbu:
https://www.ssi-austria.at/shop/products/books/books-in-english/books-chnn/restricted-books-chnn-in-english.html