APA

Estados Unidos. Department of Energy, Natural Gas Conference (1997 mar. 24-27 : Houston T. & Estados Unidos. Department of Energy. (1997). Natural Gas Conference Proceedings. Pittsburgh: U.S Department of Energy.

Chicago

Estados Unidos. Department of Energy, Natural Gas Conference (1997 mar. 24-27 : Houston Texas) and Estados Unidos. Department of Energy. 1997. Natural Gas Conference Proceedings. Pittsburgh: U.S Department of Energy.

Harvard

Estados Unidos. Department of Energy, Natural Gas Conference (1997 mar. 24-27 : Houston T. and Estados Unidos. Department of Energy. (1997). Natural Gas Conference Proceedings. Pittsburgh: U.S Department of Energy.

MLA

Estados Unidos. Department of Energy, Natural Gas Conference (1997 mar. 24-27 : Houston Texas) and Estados Unidos. Department of Energy. Natural Gas Conference Proceedings. Pittsburgh: U.S Department of Energy. 1997.