By Phillipson John

Published by Edward Arnold, 1966

By T.R.E.south wood

Published by ELBS and chapman and hall, 1978

By P.Michael

Published by Tata Mcgraw Hill Publishing Co.Ltd., 1990

By Eugene P Odum

Published by Oxford IBH publishing Co. pvt. Ltd., 1975

By Eugene P.Odum

Published by Multiline Books, 0

By Amjad Ali Bhatti

Published by Azeem Academy

By Malik Muhammad Zahir Faridi

Published by Abdullah Brothers, 0

By William H. Greene

Published by Pearson, 2012

By William H Greene

Published by Pearson, 2013

By Jack Johston & John Dinardo

Published by The McGraw Hill Companies Inc., 2007