"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2449-LCQ : 10 February 2018), John Gronkofski and Anna Mcdermott, 30 Oct 1904; citing Marriage, New York City, Richmond, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,685,182.