During my Travels, and times when I studied for numerous hours a day , Jnana Yoga was the lead horse, or dominant Yoga Practice, I read a lot! I still read a good amount. I hope you find these books of interest.
Translations of the Yoga Sutras of Patanjali
· The Yoga Sutras of Patanjali
Translated by/introduced by Alistair Shearer
· The Yoga Sutras of Patanjali
Translation & Commentary by Sri Swami Satchidananda
· The Textbook of Yoga Psychology
Ramamurti S. Mishra, M.D.(Shri Brahmananda Sarasvati)
Translations of the Bhagavad Gita
· The Living Gita: The Complete Bhagavad Gita
Sri Swami Satchidananda
· The Bhagavad Gita
Winthrop Sargeant
Foreward by: Christopher Chapple
· Bhagavad Gita : As It Is
His Divine Grace A.C. Bhaktivedanta
Ashtanga Yoga
· Yoga Mala
Sri K. Pattabhi Jois
· Ashtanga Yoga
The Practice Manual
David Swenson
· Ashtanga Yoga
The Definitive Step-by-Step Guide to a Dynamic Yoga
John Scott
Foreword by: Sri K. Pattabhi Jois
Other readings for a Hatha Yoga Practice
· Light on Yoga
B.K.S. Iyengar
Foreword by: Yehundi Menuhin
· Moola Bandha :The Master Key
Swami Buddhananda
· The Tree of Yoga
B.K.S. Iyengar
· The Shambhala Encyclopedia of Yoga
Georg Feururstein, Ph. D
· The Heart of Yoga: Developing a Personal Practice
T.K.V. Desikachar
Interesting People/Interesting Biographies
Autobiography of a Spiritually Incorrect Mystic
Osho
Miracle of Love: Stories about Neem Karoli Baba
Compiled by Ram Dass
Life and Teaching of ŚRĪ ĀNANDAMAYĪ MĀ
Dr. Alexander Lipski
·Amma :Healing the heart of the World
Judith Cornell
Devotional Yoga
· The Yoga of Kirtan Conversations on the Sacred Art of Chanting
Steven Rosen
· The Heart of Awareness A Translation of the Ashtavakra Gita
Thomas Byron
· The Yoga of Spiritual Devotion A Modern translation of the Narada Bhakti Sutras
Prem Prakash
Other influential readings
· The Prophet
Kahill Gibran
· Classics of Indian Spirituality
Translated by Eknath Easwaran
· Siddhartha
Hermann Hesse
· Ramayana
Retold by William Buck
· Mipam The First Tibetan Novel
Lama Yongden