"New York, Births and Christenings, 1640-1962," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/V2CS-TMQ : accessed 23 Dec 2012), Willem Clerk in entry for Roelof Clerk, 03 Dec 1758; citing reference , FHL microfilm 534199 father's name: Willem Clerk, mother's name: Lisabeth Decker