Bhagavad Gita Book: https://voiceofrishis.myshopify.com/collections/all ശിവാനന്ദലഹരി book : https://www.amazon.in/dp/8193056922/ Devi Tathvam (Ernakulam 2004) Sri Ramanacharana Tirtha (Nochur) Swami https://www.voiceofrishis.org