Cita APA (7a ed.)

Hepple, P. (1973). Outlook for natural gas a quality fuel. John Wiley.

Cita Chicago Style (17a ed.)

Hepple, Peter. Outlook for Natural Gas a Quality Fuel. New York: John Wiley, 1973.

Cita MLA (8a ed.)

Hepple, Peter. Outlook for Natural Gas a Quality Fuel. John Wiley, 1973.