This video is concerning the four authorities and evidences of reality in Hinduism!!!
The 4 authorities and evidences of reality: https://nithyanandatruth.org/nithyananda-yogic-sciences/ Nithyananda compilation of the shastras chanting/directions: http://anyflip.com/uyrb/ipvd/fundamental
Amazon Nithyananda books:
Many books of Swamiji: https://www.nithyananda.org/guide#gsc.tab=0
Books of Sri Nithyananda Paramashivam on Goodreads:https://www.goodreads.com/creator/listing/2775949.Paramahamsa_Nithyananda