एपीए उद्धरण

Premachandran, P. N. (2007). Bench mark soils of Kerala. Soil Survey Organisation.

शिकागो स्टाइल उद्धरण

Premachandran, P N. Bench Mark Soils of Kerala. New Delhi: Soil Survey Organisation, 2007.

एमएलए उद्धरण

Premachandran, P N. Bench Mark Soils of Kerala. Soil Survey Organisation, 2007.