Kavitha.G. Kumar ,E.Raghavendra Kumar, N.Pawan Swathi,B. text Hyderabad SevenHills International Publishers 2021 monographic 176p. 21cm(pbk) P. Bala Subramanyam...[et.al.] 683.83 9789380831367 ENG-131793 DBAD/PUB 20220225122423.0