By Dr. B V Pattabhiram
By Bommakanti Srinivasacharyulu
By Madduri Padmavathi Vajjulu
By Ganti Suryanarayana
By Castro
By Dr.Galli Bala Sundara Rao
By Nom Chamsky And Translated by Mukavaram Pardhasaradhi
By G.K Gupta
By Narayana D.V.V.S
By Kodidasu Subhadra
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