| referring to sources
|
|
|
|
| [X] reports that ... |
|
12
|
0
|
| The opinion of [X] is that ... |
|
12
|
0
|
| In his book [X] pointed out that ... |
|
12
|
0
|
| On page [three] of [X]'s article you can find the following definition: ... |
|
12
|
0
|
| According to [X] ... |
|
12
|
0
|
| Research by [X] suggests that ... |
|
12
|
0
|