APA

Lacey J., Roberts G., British Gas Corporation, World Petroleum Congress (11th. : 1983 : London), Roberts G. & British Gas Corporation.The development and application of coal gasification technology. : .

Chicago

Lacey J.A, Roberts G.F.I, British Gas Corporation, World Petroleum Congress (11th. : 1983 : London), Roberts G.F.I and British Gas Corporation.The development and application of coal gasification technology. : .

Harvard

Lacey J., Roberts G., British Gas Corporation, World Petroleum Congress (11th. : 1983 : London), Roberts G. and British Gas Corporation.The development and application of coal gasification technology. : .

MLA

Lacey J.A, Roberts G.F.I, British Gas Corporation, World Petroleum Congress (11th. : 1983 : London), Roberts G.F.I and British Gas Corporation.: . .