I have read the book Yoga- Union with reality. It makes a very interesting study. The ancient teachings brought out are very practical. Every seeker of Truth should have it. Different systems of yoga are explained with clarity. The author has also gone in depth to bring inner reflections with a poetical touch.
I recommend this book to every seeker of Yoga to read it and apply its time tested teachings in his or her life.

His Holiness Swami Vimalananda
Personal disciple of H.H. Swami Sivananda Saraswati, Senior Monk of 
Shivananda Ashram, Divine Life Society,
Rishikesh, India.