APA

Chengwu M., Hequn L., CPPEI, World Petroleum Congress (15th. : 1997 : Beijing), Hequn L. & CPPEI.Northeast Asia gas demand and transportation in the 21st century. : .

Chicago

Chengwu Miao, Hequn Liu, CPPEI, World Petroleum Congress (15th. : 1997 : Beijing), Hequn Liu and CPPEI.Northeast Asia gas demand and transportation in the 21st century. : .

Harvard

Chengwu M., Hequn L., CPPEI, World Petroleum Congress (15th. : 1997 : Beijing), Hequn L. and CPPEI.Northeast Asia gas demand and transportation in the 21st century. : .

MLA

Chengwu Miao, Hequn Liu, CPPEI, World Petroleum Congress (15th. : 1997 : Beijing), Hequn Liu and CPPEI.: . .