| Europa League 1964/1965 - Appearances as Referee |  |
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| 14/10/1964 | Everton FC | - | Vålerenga IF | 4:2 | - | - | - |
| Europa League 1964/1965 - Appearances as Referee | |
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| 14/10/1964 | Everton FC | - | Vålerenga IF | 4:2 | - | - | - |
| Complete name: | Wilhelmus Jacobus Maria Schalks |
| Born: | 21/03/1923 † 25/10/2017 |
| Place of birth: |
Leiden, 
Netherlands |
| Residence: | Leiden |
| Nationality: |
Netherlands |