| Value | Category |
|---|---|
| -97 | Not applicable |
| 1 | Other businessmen who have products similar to yours |
| 2 | Other supplier or customers |
| 3 | Business association |
| 4 | Government agency |
| 5 | Your own research |
| 6 | Family and relatives |
| 7 | Friends |
| 2147483622 | Don't know |
| 2147483623 | Refused to respond |
| 11 | .Z |
| Sysmiss |