Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.