एपीए उद्धरण

Ashok Kumar, N. (1988). Economics of Bio-Gas Evaluation. The Times Research Foundation.

शिकागो स्टाइल उद्धरण

Ashok Kumar, N. Economics of Bio-Gas Evaluation. Pune: The Times Research Foundation, 1988.

एमएलए उद्धरण

Ashok Kumar, N. Economics of Bio-Gas Evaluation. The Times Research Foundation, 1988.