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- [S48] Magazine: New York Genealogical and Biographical Record, 12 May 2012, John Calder Pearson, "The Cromwell and Lewis Families of the Mohawk Valley," January 1910.
- [S273] New York, Niagara County, U.S., New York, Niagara, Royalton -- 1855 New York Census, (Digital images. Ancestry.com. http://ancestry.com : 2013), Town of Royalton, dwelling 189, family 195, line 43, Ephraim Butler household; (http://ancestry.com).
- [S274] New York, Niagara County, U.S., New York, Niagara, Royalton -- 1850 U.S. Census, (http://ancestry.com: National Archives and Records Administration, 2009), M432, roll M432_560, Town of Royalton, p. 32 (penned), dwelling 214, family 225, Ephraim Butler household.
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