APA (7th ed.) Citation

(1991). Worldwide natural gas industry directory. PennWell Pub. Co..

Chicago Style (17th ed.) Citation

Worldwide Natural Gas Industry Directory. Tulsa, OK: PennWell Pub. Co., 1991.

MLA (9th ed.) Citation

Worldwide Natural Gas Industry Directory. PennWell Pub. Co., 1991.

Warning: These citations may not always be 100% accurate.