By R.L.Thomas

Published by Tata McGraw Hill Education Private Limited, 2011

By Brain Siler and Jeff Spotts

Published by Prentice Hall of India, 1998

By B.Russell

Published by Penguin Books, 1963

By Eugen webes

Published by Vannostrank and Co, 0

By E.W.Thacnerary

Published by Collins, 1963

By P.C.Vashishta

Published by S.Chand and Co. Ltd., 1990

By Shanti Narayan

Published by S.Chand and Co, 1961

By Muhammad Zahid Rafiq Bhatti

Published by Ilmi Kitab Khana, 2003

By Dr. S.M.Yusuf

Published by Ilmi Kitab Khana, 1994

By Murray R. Spiegel

Published by McGraw Hill, 0