Murphy, Raymond. Essential grammer in use : a Self -study reference and practice book for elementary students of english with answer / Raymond Murphy. - New Delhi : Cambridge University Press, 2007. - xi, 319 p. : ill. ; 22 cm. Includes index. ISBN: 9780521133937 0521133939 Subjects--Topical Terms: Dewey Class. No.: 428.24 / MUE 2014