APA

Badakhshan A., University of Calgary, World Petroleum Congress (15th. : 1997 : Beijing) & University of Calgary.Natural gas and its share of present and future global energy supply and demand. : .

Chicago

Badakhshan Amir, University of Calgary, World Petroleum Congress (15th. : 1997 : Beijing) and University of Calgary.Natural gas and its share of present and future global energy supply and demand. : .

Harvard

Badakhshan A., University of Calgary, World Petroleum Congress (15th. : 1997 : Beijing) and University of Calgary.Natural gas and its share of present and future global energy supply and demand. : .

MLA

Badakhshan Amir, University of Calgary, World Petroleum Congress (15th. : 1997 : Beijing) and University of Calgary.: . .