APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.