"Mississippi, County Marriages, 1858-1979," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Z2W4-FYZM : 4 June 2020), Willliam L McKinley, 24 Nov 1841; citing Marriage, Monroe, Mississippi, United States, 00165, citing multiple county clerks; Mississippi Department of Archives and History, Jackson.
"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MXLP-W57 : 23 December 2020), William L Mc Kinley, Smith, Texas, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).