Cita APA (7a ed.)

Hughes, W. E. (2016). Fundamentals of international oil and gas law. PennWell Corporation.

Cita Chicago Style (17a ed.)

Hughes, William E. Fundamentals of International Oil and Gas Law. Tulsa, Oklahoma: PennWell Corporation, 2016.

Cita MLA (8a ed.)

Hughes, William E. Fundamentals of International Oil and Gas Law. PennWell Corporation, 2016.