Here is an outdated shortlist, but one that never gets old – listed in no particular order.  

(Please contact me if you would like individual recommendations.)

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1. Patanjali’s Yoga Sutra (many translations, some more approachable and some more dense)
2. The Bhagavad Gita (also many translations)
3. Hatha Yoga Pradipika
4. The Radiance Sutras (Lorin Roche)
5. Ka (Roberto Calasso)
6. The Mirror of Yoga (Richard Freeman)
7. Meditation Secrets for Women (Camille Maurine and Lorin Roche)
8. Tantra Illuminated (Christopher Wallis)
9. Awakening Shakti (Sally Kempton)
10. The Key Poses of Yoga (Ray Long)
11. The Key Muscles of Yoga (Ray Long)
12. The Art of Vinyasa (Richard Freeman and Mary Taylor)
13. At the Eleventh Hour (Pandit Rajmani Tigunait)
14. Path of Fire and Light (Swami Rama)
15. Yoga of the Subtle Body (Tias Little)
16. Living with the Himalayan Masters (Swami Rama)
17. Aghora (Robert Svoboda)
18. Aghora II: Kundalini (Robert Svoboda)
19. The Mother (Sri Aurobindo)
20. Journey to the Mother (Alakananda Ma)
21. Yoga and Psychotherapy (Swami Rama, Rudolph Ballentine, Swami Ajaya)
22. Liberation – An Interpretation of Isha Upanishad (Anand Mehrotra)
23. When Love Comes to Light (Richard Freeman and Mary Taylor)
24. This is That (Anand Mehrotra)
25. That is This (Anand Mehrotra)
26. Feeling Happy (Richard Freeman and Mary Taylor)
27. Gitanjali (Rabindranath Tagore)
28. Light on Life (Hart De Fouw and Robert Svoboda)