APA

Czernie W., World Energy Congress (18th. : 2001 oct. 21-25 : Buenos Aires), .Natural gas liberalisation and deregulation in Europe. : .

Chicago

Czernie Wilfried, World Energy Congress (18th. : 2001 oct. 21-25 : Buenos Aires), .Natural gas liberalisation and deregulation in Europe. : .

Harvard

Czernie W., World Energy Congress (18th. : 2001 oct. 21-25 : Buenos Aires), .Natural gas liberalisation and deregulation in Europe. : .

MLA

Czernie Wilfried, World Energy Congress (18th. : 2001 oct. 21-25 : Buenos Aires), .: . .