APA

Ring M., Petrotechnical Open Software Corporation, World Petroleum Congress (15th. : 1997 : Beijing) & Petrotechnical Open Software Corporation.POSC and the emerging E&P business perspective. : .

Chicago

Ring M.J, Petrotechnical Open Software Corporation, World Petroleum Congress (15th. : 1997 : Beijing) and Petrotechnical Open Software Corporation.POSC and the emerging E&P business perspective. : .

Harvard

Ring M., Petrotechnical Open Software Corporation, World Petroleum Congress (15th. : 1997 : Beijing) and Petrotechnical Open Software Corporation.POSC and the emerging E&P business perspective. : .

MLA

Ring M.J, Petrotechnical Open Software Corporation, World Petroleum Congress (15th. : 1997 : Beijing) and Petrotechnical Open Software Corporation.: . .