Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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