By Prof. Iqbal A Bhatti

Published by Bhatti Publishers, 1992

By Nathan Altshiller court

Published by Branes and Noble, 1962

By A.K.Sharma

Published by Orient Paper and Phnlishers

By G.L Thrhan

Published by Sterling Publishers, 1985

Published on 1974

By Charles H.Sisam

Published by Henry Holt & Co., 1951

By Clarence E Bennett

Published by Barnes and noble books, 1967

By Frederick J Bueche

Published by McGraw Hill Company, 2000

By Zoe L. Allright

Published by Mc Graw Hill, 2019

Published by Feroz sons, 1985