Datason, R.P. . New light`s CDS combined defence service exam guide / by R.P. Datason, S.L. Gulati and B.L. Sadana. - 23rd ed / - New Delhi : New light publishers , 2004 - 144p : ISBN: 81-85018-39-1 Subjects--Topical Terms: Political science Dewey Class. No.: W:1941 / P4