APA aipamena

Lakshman Singh. (2000). Oil and gas fields of India. Indian petroleum publishers.

Chicago Style aipamena

Lakshman Singh. Oil and Gas Fields of India. Dehradun: Indian petroleum publishers, 2000.

MLA aipamena

Lakshman Singh. Oil and Gas Fields of India. Indian petroleum publishers, 2000.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.