By Ernest Hemingway

Published by The New Kitab Mahal, 2013

By Barnard A.K.

Published by McGraw Hill, 1965

By Shahnaz Akhtar

Published by Research Society of Pakistan, 2005

By John D. Barrow

Published by Vintge, 1992

By Ernest R. Hilgard

Published by National Book Foundation, 1986

By Charles Darwin

Published by Collier Books, 1962

Published on 1985

By daroga singh and F.S.Chaudhary

Published by Wiley Eastern LTd., 1989

By SL.Setd

Published by S. Chand and Co, 1962

By Spiegel Murray R.

Published by Schaums outline series, 1963