APA

International Gas Union I., World Gas Conference (20th. : 1997 jun 10-13 : Copenhagen) & International Gas Union I. (1997). Utilization of gases for the transportation sector. Netherlands: International Gas Union, IGU.

Chicago

International Gas Union IGU, World Gas Conference (20th. : 1997 jun 10-13 : Copenhagen) and International Gas Union IGU. 1997. Utilization of gases for the transportation sector. Netherlands: International Gas Union, IGU.

Harvard

International Gas Union I., World Gas Conference (20th. : 1997 jun 10-13 : Copenhagen) and International Gas Union I. (1997). Utilization of gases for the transportation sector. Netherlands: International Gas Union, IGU.

MLA

International Gas Union IGU, World Gas Conference (20th. : 1997 jun 10-13 : Copenhagen) and International Gas Union IGU. Utilization of gases for the transportation sector. Netherlands: International Gas Union, IGU. 1997.