एपीए उद्धरण

Pottekkattu, S. K. (1990). Nisagandhi. Sumithra Jayaprakash; sold by NBS.

शिकागो स्टाइल उद्धरण

Pottekkattu, S. K. Nisagandhi. Kottayam: Sumithra Jayaprakash; sold by NBS, 1990.

एमएलए उद्धरण

Pottekkattu, S. K. Nisagandhi. Sumithra Jayaprakash; sold by NBS, 1990.