APA-referens (7:e uppl.)

(1990). Natural gas: Its role and potential in economic development. Westview pr..

Chicago-referens (17:e uppl.)

Natural Gas: Its Role and Potential in Economic Development. Boulder: Westview pr., 1990.

MLA-referens (9:e uppl.)

Natural Gas: Its Role and Potential in Economic Development. Westview pr., 1990.