By V.S.R
Dunga Dileep Kumar
Anandam Krishnamurthi
Poolabala
Yeedu Srinivasa Rao
R.V. Rao
Rajeev Garg ( Pocket Guide Book)
V.S.R
Paravastu Chinnaiah Suri (Vyakhyata Vantaram Ramakrishna Rao)
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