APA
United Nations International Seminar on Petroleum Refining in Developing Countries (22nd January-3 February: 1973: New Delhi), . (1973). Proceedings of the United Nations interregional seminar on petroleum refining in developing countries. New Delhi: Indian Oil Corporation.
Chicago
United Nations International Seminar on Petroleum Refining in Developing Countries (22nd January-3 February: 1973: New Delhi), . 1973. Proceedings of the United Nations interregional seminar on petroleum refining in developing countries. New Delhi: Indian Oil Corporation.
Harvard
United Nations International Seminar on Petroleum Refining in Developing Countries (22nd January-3 February: 1973: New Delhi), . (1973). Proceedings of the United Nations interregional seminar on petroleum refining in developing countries. New Delhi: Indian Oil Corporation.
MLA
United Nations International Seminar on Petroleum Refining in Developing Countries (22nd January-3 February: 1973: New Delhi), . Proceedings of the United Nations interregional seminar on petroleum refining in developing countries. New Delhi: Indian Oil Corporation. 1973.