APA (7th ed.) Citation

Petroleum Economist Ltd & Elster Group. (1997). The history and development of gas measurement. Petroleum Economist.

Chicago Style (17th ed.) Citation

Petroleum Economist Ltd and Elster Group. The History and Development of Gas Measurement. London: Petroleum Economist, 1997.

MLA (9th ed.) Citation

Petroleum Economist Ltd and Elster Group. The History and Development of Gas Measurement. Petroleum Economist, 1997.

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