Cita APA (7th ed.)

Hay, N. E. (1985). Guide to new natural gas utilization technologies. Fairmont Press.

Cita Chicago (17th ed.)

Hay, Nelson E. Guide to New Natural Gas Utilization Technologies. Atlanta, GA: Fairmont Press, 1985.

Cita MLA (9th ed.)

Hay, Nelson E. Guide to New Natural Gas Utilization Technologies. Fairmont Press, 1985.

Atenció: Aquestes cites poden no estar 100% correctes.