The book "Yoga-Union with Reality" by Swami Ramakrishnananda is very good Comprehensive work of different yogas of the Indian philosophy. The author has explained the different yogas, giving examples from many Indian scriptures-Vedas, Srimad Bhagavadgita, Patanjali Yoga Sutras and so many others. This book is very Useful for Spiritual Aspirants.

 

His Holiness Swami Divyajeevanananda 

Sivananda Ashram,

Rishikesh, India.