Dyfyniad APA

India. Dept. of Petroleum. (1981). Annual report. Govt. of India, Ministry of Petroleum, Chemicals, and Fertilizers, Dept. of Petroleum.

Dyfyniad Arddull Chicago

India. Dept. of Petroleum. Annual Report. New Delhi: Govt. of India, Ministry of Petroleum, Chemicals, and Fertilizers, Dept. of Petroleum, 1981.

Dyfyniad MLA

India. Dept. of Petroleum. Annual Report. Govt. of India, Ministry of Petroleum, Chemicals, and Fertilizers, Dept. of Petroleum, 1981.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.