Look up: Yoga-sutras

1. Yoga-sutras
   (from the article `Indian philosophy`) The Yoga-stras of Patañjali (2nd century ) are the earliest extant textbook on Yoga. Scholars now generally agree that the author of the Yoga-stras ... author or one of the authors of two great Hindu classics: the first, Yoga-stras, a categorization of Yogic thought arranged in four volumes ...
   Found on http://www.britannica.com/eb/a-z/y/9
   
   
2. Yogasutras
   Famous work by Patanjali (q.v.) on which is founded Yoga, one of the great systems of Indian philosophy (q.v.). It is essentially a mental discipline in eight stages (see Yoga) for the attainment of spiritual freedom without neglecting physical and moral preparation. In philosophic outlook, the sutr...
   Found on http://www.ditext.com/runes/y.html