Andhra Sri Vishnu Puranamu by Vennelakanti Suranarya (15th century poet) found in Archives and published by Vavilla in 1928
Vennelakanti Suranarya of 15 th century
<a rel="nofollow" class="external free" href="https://archive.org/details/in.ernet.dli.2015.373342/mode/2up">https://archive.org/details/in.ernet.dli.2015.373342/mode/2up</a>