"Montana, County Marriages, 1865-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:F3Q5-VZP : 2 March 2021), John Boyle in entry for Leonard Sergent and Mary Boyle, 11 Jan 1920; citing Marriage, Miles City, Custer, Montana, various county courthouses, Montana; FHL microfilm 1,940,867.
"Montana Death Index, 1860-2007," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VHCR-LSX : 9 December 2014), John Boyle, 07 Feb 1937; from "Montana Death Index, 1868-2011," database, Ancestry (http://www.ancestry.com : 2009); citing State of Montana Department of Public Health and Human Services, Office of Vital Statistics, Helena.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9S3-JVH : accessed 1 June 2022), John W Boyle, Brainerd city Ward 3, Crow Wing, Minnesota, United States; citing enumeration district (ED) 57, sheet 4B, family 57, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,761.
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