The literature surrounding , the deathless Himalayan master, focuses on the preservation and dissemination of Kriya Yoga
: A profound set of statements focusing on Vedantic philosophy, mental control, and the "full light" of his message. Babaji and the 18 Siddha Kriya Yoga Tradition
Sri Yukteswar wrote this book at the request of Babaji to show the underlying unity between the Bible and Hindu scriptures.
If you are researching this subject, these are the most authoritative and well-known titles: