Bala, A. Usha creator Rao, G. Nageswara Shakeel, Shaik Sreekanth, K. Hyderabad Spectrum Educational Books 2022 First edition. xiv, 162p.; 25cm(pbk) A. Usha Bala et al 305.42 9789395820004 ENG-137400 DBAD/Pub 20230714152129.0