| List I | List II | ||
| A | Copyscape | 1 | 2011 |
| B | PlagTracker | 2 | 1998 |
| C | Turnit In | 3 | 2004 |
| D | ET Blast | 4 | 2005 |
1
A-2, B-1, C-3, D-4
2
A-3, B-1, C-2, D-4
3
A-3, B-1, C-4, D-2
4
A-1, B-3, C-2, D-4
| List I | List II | ||
| A | Copyscape | 1 | 2011 |
| B | PlagTracker | 2 | 1998 |
| C | Turnit In | 3 | 2004 |
| D | ET Blast | 4 | 2005 |