APA

International Gas Union I., World Gas Conference (22nd. : 2003 jun 1-5 : Tokyo) & International Gas Union I. (2003). World Gas Conference Tokyo 2003. Tokio: International Gas Union, IGU.

Chicago

International Gas Union IGU, World Gas Conference (22nd. : 2003 jun 1-5 : Tokyo) and International Gas Union IGU. 2003. World Gas Conference Tokyo 2003. Tokio: International Gas Union, IGU.

Harvard

International Gas Union I., World Gas Conference (22nd. : 2003 jun 1-5 : Tokyo) and International Gas Union I. (2003). World Gas Conference Tokyo 2003. Tokio: International Gas Union, IGU.

MLA

International Gas Union IGU, World Gas Conference (22nd. : 2003 jun 1-5 : Tokyo) and International Gas Union IGU. World Gas Conference Tokyo 2003. Tokio: International Gas Union, IGU. 2003.