 |  | Nigerian National Petroleum Corporation, Jan- Dec 2001 |
| | Nigerian National Petroleum Corporation, Jul 2002 |
| | Nigerian National Petroleum Corporation, Mar 2001 |
| | Nigerian National Petroleum Corporation, Jan- Dec 2000 |
| | Nigerian National Petroleum Corporation, Apr 2002 |
| | Nigerian National Petroleum Corporation, Jan- Mar 2000 |
| | Nigerian National Petroleum Corporation, Jan- Dec 1999 |
| | Nigerian National Petroleum Corporation, Jan- Dec 2002 |
| | Fairplay Solutions, Issue 161, Feb 2010 |
| | Fairplay Vol.368,Issue 6574, Mar.18, 2010 |
| | Nigerian National Petroleum Corporation, Feb 2002 |
| | Nigerian National Petroleum Corporation, Aug 2002 |
| | Nigerian National Petroleum Corporation, Mar 2002 |
| | Nigerian National Petroleum Corporation, Jan 2001 |
