Commentaries on the Yoga Sutras (Raja Yoga)
Inside the Yoga Sutras
Rev. Jaganath Carrera
The Yoga Sutras of Patanjali
Swami Satchidananda
Patanjali’s Yoga Sutra
Shyam Ranganathan
How To Know God
Swami Prabhavananda and Christopher Isherwood
Tantra of the Yoga Sutras
Alan Finger
Raja Yoga
Swami Vivekananda
Raja Yoga
Sivananda
Books related to Raja but broader
Yoga & Ayurveda
David Frawley
Yoga and Vegetarianism
Sharon Gannon
Practical Yoga Psychology
Dr. Rishi Vivekananda
Hatha Yoga Pradipika
Swami Muktibodhananda
Yoga of the Subtle Body
Tias Little
On Meditation
Awaken: Inside Yoga Meditation
Rev. Jaganath Carrera
Stages of Meditation
The Dalai Lama
Meditation, the Art of Ecstasy
Osho
Miscellaneous subjects
One Simple Thing: A New Look at the Science of Yoga and How It Can Transform Your Life
Eddie Stern
The Living Gita
Swami Satchidananda
The Bhagavad Gita
The Upanishads