Kundalini Yoga
Sivananda
Divine Life Society
I know there is a lot of stuff out there about kundalini so it is very easy to get confused by all the different disinformation.

This book is the real deal unlike many teachers and books out there with unwary confused followers. 
Master Sivananda doesn't small talk or mince words but gets right to the point. You will learn some valuable tools for kundalini, meditation, pranayama and yoga in this very perfect book.

AGLA (Acción Gnóstica Libertadora de Amerindia, "Liberating Gnostic Action of Amerindia") was a group that was founded that included Samael Aun Weor and Sivananda. Between the two of them  you can gather the highest teaching available for Kundalini. 

The Teachings here are very pure and legitimate and so are very hard to hear with an ego..