APA (7th ed.) Citation

(1973). A Pro-Forma Regulation for the conservation of petroleum resources. Information Department of OPEC.

Chicago Style (17th ed.) Citation

A Pro-Forma Regulation for the Conservation of Petroleum Resources. Vienna: Information Department of OPEC, 1973.

MLA (9th ed.) Citation

A Pro-Forma Regulation for the Conservation of Petroleum Resources. Information Department of OPEC, 1973.

Warning: These citations may not always be 100% accurate.