Shiva Samhita

This is a classic Sanskrit text where Lord Shiva addresses Parvati his consort. There are 5 chapters which deal with yogic philosophy, techniques for liberation, kundalini, pranayama, asanas, mudras, bandhas, and meditation, and the role of a guru. The book mentions 84 beneficial asanas but describes only four of them.

The other texts that Nithya Kriya draws from include the Kumbhaka Paddhati of Raghuvira, Trisikhibrahmanopanishad, Yogakundalay Upanishad, Yoga Chudamani Upanishad and Yoga Taravali, JogaPradipika, Yogasana Mala Sachitra, among others.