एपीए उद्धरण

Unnikrishnapillai, C. (2003). Essential written english. DC Books.

शिकागो स्टाइल उद्धरण

Unnikrishnapillai, C. Essential Written English. Kottayam: DC Books, 2003.

एमएलए उद्धरण

Unnikrishnapillai, C. Essential Written English. DC Books, 2003.