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 received empowerment into the Dzogchen practice from Namkhai Norbu, I am partial to His teachings, of course.
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