By Dr. B V Pattabhiram
By Padmaja Srinivas
By Dr.Galli Bala Sundara Rao
By .
By Madduri Padmavathi Vajjulu
By Nom Chamsky And Translated by Mukavaram Pardhasaradhi
By G.K Gupta
By Narayana D.V.V.S
By Varanasi Abhitukuchalamba
By Yuvamitra
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