By Bhupendra Singh and Dr.Sudhir K Pundir

Published by Pragati Prakashan, 2007

By M.L.Sisodia, G.S. Raghuvanshi

Published by Wiley Eastern ltd., 1987

By Fujia Yand and Joseph H Hamiltan

Published by National Book Foundation, 2004

By Harvey E.White

Published by CBS publishers & Distributors, 1987

By Robert L Sproul

Published by Sang e meel publications, 1986

By Kenneth S. Krane

Published by John wiley and sons, 1983

By Kenneth S. Krane

Published by John Willey and Sons Inc., 1996

By D.R.Khannia

Published by Khanna Publishers, 1986

By Dr. Abdul Bashir Pall

Published by M.r.Brothers, 0

By B.V.Narayana, Rao

Published by Wiley Eastern Ltd, 1988