If you would like to cite this person in a Wikipedia article please use the following template:
<ref name=CH>{{cite web |url=https://www-4.collection.cooperhewitt.org/people/18047983/ |title=Ch. H. Geffroy |author=Cooper Hewitt, Smithsonian Design Museum |accessdate=14 February 2025 |publisher=Smithsonian Institution}}</ref>
