एपीए उद्धरण

Gopalakrishnan Perumpuzha. (2016). O N V Ormakalil Sugandham. Prabhath Book House.

शिकागो स्टाइल उद्धरण

Gopalakrishnan Perumpuzha. O N V Ormakalil Sugandham. Thiruvananthapuram: Prabhath Book House, 2016.

एमएलए उद्धरण

Gopalakrishnan Perumpuzha. O N V Ormakalil Sugandham. Prabhath Book House, 2016.