By Brother H Raphael

Published by Macmillan Co., 1960

By Stewart C. Eston

Published by Barnes and Noble, 1962

By Stephen W.Hawking

Published by Bantan Books, 1996

By Stewart G Easton

Published by Barnes and noble, 1962

By Dr.Karamat Hussain Dar

Published by Ferozsons, 1998

By Dipak Chatterjee

Published by Prentic-Hall of India, 2001

By David S.Dummit and Richard M.Foote

Published by John Wiley and sons Inc., 1999

By Dr.Ata Mohy ud Din

Published by Feroz Sons, 0

By Dr.K.P.Srivastava, Dr.P.K.Garg

Published by Academic)India) Publishers, 2005

By K.B.Kalra

Published by Academic India Publishers, 2004