APA

International Gas Union I., World Gas Conference (23rd. : 2006 jun 5-9 : Amsterdam T. N. & International Gas Union I. (2006). World Gas Conference 5-9 june 2006, Amsterdam, The Netherlands. Amsterdam: International Gas Union, IGU.

Chicago

International Gas Union IGU, World Gas Conference (23rd. : 2006 jun 5-9 : Amsterdam The Netherlands) and International Gas Union IGU. 2006. World Gas Conference 5-9 june 2006, Amsterdam, The Netherlands. Amsterdam: International Gas Union, IGU.

Harvard

International Gas Union I., World Gas Conference (23rd. : 2006 jun 5-9 : Amsterdam T. N. and International Gas Union I. (2006). World Gas Conference 5-9 june 2006, Amsterdam, The Netherlands. Amsterdam: International Gas Union, IGU.

MLA

International Gas Union IGU, World Gas Conference (23rd. : 2006 jun 5-9 : Amsterdam The Netherlands) and International Gas Union IGU. World Gas Conference 5-9 june 2006, Amsterdam, The Netherlands. Amsterdam: International Gas Union, IGU. 2006.