N Sources/Participants | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Sole academic source |
|
|
|
|
|
|
|
|
|
|
Two or three sources | + |
|
| + |
|
|
|
|
|
|
Several Sources (4+) |
| + | + |
| + |
| + | + | + | + |
Professor’s reader |
| + | + |
| + | + |
|
| + | + |