Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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