De inmiddels bekende arts is vermeld in het telefoonboek,
zie boeken basis, website delpher.nl } jaar 1941 (Deel -> jan.1941)
Amstelveen. (telefoon / naam / adres, straatnaam, huisnummer)
2670 Sikkel, J. C. Arts, K. Karelw. 423.
(bladeren door dit boek, pag.: 5 / 1432) Permanente URL = Titel }
https://resolver.kb.nl/resolve?urn=MMMVC01:000000034
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Permanente URL = Pagina} https://resolver.kb.nl/resolve?urn=MMMVC01:000000034:00005
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