https://www.amazon.com/Ajna-Chakra-Rishi-Nityabhodananda/dp/...
Tattwa Shuddhi: The Tantric Practice of Inner Purification
https://www.amazon.com/Tattwa-Shuddhi-Tantric-Practice-Purif...
Prana Vidya
https://www.amazon.com/Prana-Vidya-Satyananda-Saraswati-Nira...
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https://www.amazon.com/Ajna-Chakra-Rishi-Nityabhodananda/dp/...
Tattwa Shuddhi: The Tantric Practice of Inner Purification
https://www.amazon.com/Tattwa-Shuddhi-Tantric-Practice-Purif...
Prana Vidya
https://www.amazon.com/Prana-Vidya-Satyananda-Saraswati-Nira...