l don't think anyone has mentioned Robert Bruce's books. He's written quite a few and Astral Dynamics was regarded as one of the bibles on the subject not long ago.
Part 1: ELEMENTS OF PROJECTION
Chapter 1-Dimensional Theory
Chapter 2-The Projectible Double
Chapter 3-The Incredible "Mind-Split" Effect
Chapter 4-Astral Sight
Chapter 5-Waking Paralysis
Chapter 6-OBE and Perception
Chapter 7-Your Higher Self and You
Part 2: NEW ENERGY WAYS
Chapter 8-You and Your Energy Body
Chapter 9-Running Energy
Chapter 10-Primary Energy Center Work
Chapter 11-Energy Work Issues
Part 3: CORE SKILLS
Chapter 12-Deep Physical Relaxation
Chapter 13-Taming the Mind
Chapter 14-Achieving The Altered State
Part 4: PROJECTION EXIT AND TECHNIQUE
Chapter 15-Preperations for Projection
Chapter 16-OBE Exercises and Techniques
Chapter 17-More OBE Techniques and Variations
Chapter 18-Projection Exit Problems
Chapter 19-Overcoming the Mind-Split
Chapter 20-Lucid Dreaming and OBES
Chapter 21-The Astral Form in Motion
Part 5: THE AKASHIC CONNECTION
Chapter 22-The Astral Planes
Chapter 23-Connecting the Chords
Chapter 24-The Akashic Records
Chapter 25-The "Astral Wind"
Part 6: STRANGE ASTRAL PHENOMENA
Chapter 26-OBE and "Reality Fluctuations"
Chapter 27-Higher Dimensional Levels
Chapter 28-Astral Beings and Wildlife
Chapter 29-Fear-Based Issues and Solutions
Chapter 30-Astral Noise and Things That Go Bump in The Night
Chapter 31-Working with your "Higher Self"