एपीए उद्धरण

Ramachandran Kodappally. (2007). Encyclopedia of inventions. Dronacharya Publications.

शिकागो स्टाइल उद्धरण

Ramachandran Kodappally. Encyclopedia of Inventions. Kozhikode: Dronacharya Publications, 2007.

एमएलए उद्धरण

Ramachandran Kodappally. Encyclopedia of Inventions. Dronacharya Publications, 2007.