First published 1973
Second edition 1974
Third edition 1975
Fourth edition 1976
Fifth edition 1978
Sixth edition 1981
Seventh edition 1983
Eighth edition 1986
Ninth edition 1989
Tenth edition 1993
Eleventh edition 1996
Twelfth edition 2002
Twelfth edition (Reprint) 2003
Thirteenth edition 2007
Thirteenth edition (Reprint) 2008
Fourteenth edition 2011
Copies: 8000
Price: 100/-
