एपीए उद्धरण

Gangadharan Thikkurissi. (2004). Kerala Varma Patanamgal (a study on Kerala Varma). Sahithya Kairali Publications.

शिकागो स्टाइल उद्धरण

Gangadharan Thikkurissi. Kerala Varma Patanamgal (a Study on Kerala Varma). Balaramapuram: Sahithya Kairali Publications, 2004.

एमएलए उद्धरण

Gangadharan Thikkurissi. Kerala Varma Patanamgal (a Study on Kerala Varma). Sahithya Kairali Publications, 2004.