APA

Rushby I., BP Exploration Operating, World Petroleum Congress (15th. : 1997 : Beijing) & BP Exploration Operating.Natural gas. : .

Chicago

Rushby Ian, BP Exploration Operating, World Petroleum Congress (15th. : 1997 : Beijing) and BP Exploration Operating.Natural gas. : .

Harvard

Rushby I., BP Exploration Operating, World Petroleum Congress (15th. : 1997 : Beijing) and BP Exploration Operating.Natural gas. : .

MLA

Rushby Ian, BP Exploration Operating, World Petroleum Congress (15th. : 1997 : Beijing) and BP Exploration Operating.: . .