Working With Kundalini — Mary Shutan
Another book by Mary Shutan, quite sane, specific, and valuable for kundalini awakening.
Working With Kundalini: An Experiential Guide to the Process of Awakening has clear descriptions of advanced kundalini stages, and includes rational and useful advice on diet, granthis, and other elements of years-long kundalini awakenings.
If you’re having a real kundalini awakening, and it’s gone on for more than 1-3 years, you need this book. She also has a list of advanced reading in the book which is staged and very, very helpful.