"Netherlands, Noord-Holland, Civil Registration, 1811-1950," database with images, FamilySearch (
https://www.familysearch.org/ark:/61903/1:1:QPM4-HDBL : 25 May 2020), Willemina Christina Kirberger in entry for Caroline Frederike Louise Lieftinck, 12 Mar 1879; citing Birth Registration, Amsterdam, Noord-Holland, Nederland, Noord-Hollands Archief (Noord-Hollands Archives), Haarlem; FHL microfilm 253,479.