principal and techniques Rajan,T.V. creator Sharma,C.P. Sharma,Ashok text Delhi PHI Learning 2011 2nd ed. monographic xviii,390p.: 23cm(pbk) ill. by T.V. Rajan,C.P. Sharma [and] Ashok Sharma Includes bibliographical references and index 672.36 9788120340954 ENG-117367 DBAD/PUB 20170306114531.0