N V P Unithiri. (1990). Sankaradarsanam marxist veekshanathil. Nayana Books.
Chicago Edition CitationN V P Unithiri. Sankaradarsanam Marxist Veekshanathil. Payyanur: Nayana Books, 1990.
MLA Edition CitationN V P Unithiri. Sankaradarsanam Marxist Veekshanathil. Nayana Books, 1990.
Warning: These citations may not always be 100% accurate.