| KNVB beker 1977/1978 - Appearances as Referee |  |
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| 09/10/1977 | Willem II | - | DWV Amsterdam | 1:2 | - | - | - |
| 31/01/1978 | Roda JC Kerkrade | - | AFC Ajax | 0:3 | - | - | - |
| KNVB beker 1977/1978 - Appearances as Referee | |
|
|
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| 09/10/1977 | Willem II | - | DWV Amsterdam | 1:2 | - | - | - |
| 31/01/1978 | Roda JC Kerkrade | - | AFC Ajax | 0:3 | - | - | - |
| Complete name: | Gerard Jonker |
| Born: | |
| Place of birth: |
Netherlands |
| Nationality: |
Netherlands |