APA (7th ed.) Citation

Institute of Gas Technology, American Gas Association, & Gregory, D. P. (1972). A hydrogen-energy system. American Gas Association.

Chicago Style (17th ed.) Citation

Institute of Gas Technology, American Gas Association, and D. P. Gregory. A Hydrogen-energy System. [Arlington, Va.]: American Gas Association, 1972.

MLA (9th ed.) Citation

Institute of Gas Technology, et al. A Hydrogen-energy System. American Gas Association, 1972.