Theun Mares, haling from South Africa, passed in 2011. His books are an awesome legacy for us to continue where he left off. Oftentimes his books are not easy to find in print and may be easier on Kindle/digital edition.
This is a series of 11 books. This book series essentially put the Toltec teachings "on the map" since 1968.
Castaneda's books are presented in story format, and so we recommend these if you are interested in the stories. There are easier ways to learn "the facts".
We suggest beginning with this one and skipping the first 2.
don Miguel Ruiz
This is probably the most well known non-story book concerning Toltec Knowledge.
Koyote the Blind
Joshua, the creator of The Quantum Theater, now has his own book for a Toltec take on storytelling.