Cita APA (7a ed.)

(2003). Natural gas & electricity. Wiley Periodicals, Inc.

Cita Chicago Style (17a ed.)

Natural Gas & Electricity. [Hoboken, N.J.]: Wiley Periodicals, Inc, 2003.

Cita MLA (9a ed.)

Natural Gas & Electricity. Wiley Periodicals, Inc, 2003.