एपीए उद्धरण

Sreedharan, P. (2008). Hridayarekha. Sankweerthanam publications.

शिकागो स्टाइल उद्धरण

Sreedharan, Perumpadavam. Hridayarekha. Kollam: Sankweerthanam publications, 2008.

एमएलए उद्धरण

Sreedharan, Perumpadavam. Hridayarekha. Sankweerthanam publications, 2008.