N V P Unithiri. (1993). Pracheena bharatheeya darsanam. Chintha.
Chicago Edition CitationN V P Unithiri. Pracheena Bharatheeya Darsanam. Thiruvanathapuram: Chintha, 1993.
Deismireacht MLAN V P Unithiri. Pracheena Bharatheeya Darsanam. Chintha, 1993.
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