APA (7th ed.) Citation

Opfell, J. B., Pings, C. J., & Sage, B. H. (1959). Equations of state for hydrocarbons. American Petroleum Institute.

Chicago Style (17th ed.) Citation

Opfell, John B., Cornelius J. Pings, and Bruce H. Sage. Equations of State for Hydrocarbons. New York: American Petroleum Institute, 1959.

MLA (9th ed.) Citation

Opfell, John B., et al. Equations of State for Hydrocarbons. American Petroleum Institute, 1959.