Ramachandran Kodappally. (2007). Encyclopedia of inventions. Dronacharya Publications.
Chicago Edition CitationRamachandran Kodappally. Encyclopedia of Inventions. Kozhikode: Dronacharya Publications, 2007.
Cita MLARamachandran Kodappally. Encyclopedia of Inventions. Dronacharya Publications, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.