Author: Comming, John
Publisher:S. Chand, Delhi
Copyright:1968
Author: Jain, Rikhab Dass
Publisher:Atma Ram & Sons, Delhi
Copyright:1960
Author: Chopra, Gulshan Lall
Publisher:Vishveshvaranand Vedic Research Institute, Hoshinapur
Copyright:1960
Author: Phadnis, Urmila
Publisher:Asia Publishing House, Bombay
Copyright:1968