↑ "New York Marriages, 1686-1980," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VK12-QF2 : 12 December 2014), Robert W. Marks and Mary Jane Terwilliger, 15 Jul 1852; citing reference ; FHL microfilm 824,284.
↑ "United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8KB-TNQ : 12 April 2016), Robert W Marks, New York, United States; citing p. 59, family 482, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,606.