Ramachandran Kodappally. (2007). Encyclopedia of inventions. Dronacharya Publications.
Chicago Edition CitationRamachandran Kodappally. Encyclopedia of Inventions. Kozhikode: Dronacharya Publications, 2007.
ציטוט MLARamachandran Kodappally. Encyclopedia of Inventions. Dronacharya Publications, 2007.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.