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| Coats of arms Grand Duché d Oldenbourg| Eigenes Werk| Jacques63| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Coats of arms Grand Duché d Oldenbourg.svg
| Wilhelm Ernst von Beaulieu-Marconnay| aus: Biographisches Handbuch zur Geschichte des Landes Oldenburg, von Hans Friedl ...- Oldenburg, Isensee, 1992| unbekannt| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='PD-alt-100' align='center' link='https://www.austria-forum.org/cc/pdm-10.html' target='_blank'}]| Datei:Wilhelm Ernst von Beaulieu-Marconnay.jpg
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