Tantra yoga, Nada yoga and Kriya yoga is hallmark of Sri Swami Sivanandas teachings. The introduction to the yogas are highly practical and also serves as an inspiration for the reader to establish a regular practice of doing he sadhanas. Sri Swami Sivananda wrote 296 books on various topics centering about Hinduism, Vedanta, spirituality, yoga and psychology. He established the organisation The Divine Life Society, now an international foundation with several ashrams and devotes around the world. You can find lots of other books by Sivananda here on the site, do a search.
Download Tantra yoga, Nada yoga and Kriya yoga here (121 pages/1.5 MB):