"Indiana, Marriages, 1811-1959", index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XX27-S7Z : accessed 7 March 2015), Heriette Stephenson in entry for George S Nichols and Annis Akard, 1915.
"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MHM6-1YG : accessed 7 March 2015), Hattie I Nichols in household of W H Nichols, Union, Boone, Indiana, United States; citing enumeration district 122, sheet 187B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0267; FHL microfilm 1,254,267.
"United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M4F8-4ZX : accessed 7 March 2015), Harriet Stephenson in household of George Stephenson, Union Township, Boone, Indiana, United States; from "1860 U.S. Federal Census - Population," Fold3.com; citing p. 9, household ID 55, NARA microfilm publication M653, National Archives and Records Administration, Washington, D.C.; FHL microfilm 803,245.
"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MHVJ-3TC : accessed 7 March 2015), Harriet Stephenson in household of George Stephenson, Boone county, part of, Boone, Indiana, United States; citing family 1735, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).