"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZZC-DGK : 9 September 2017), William L Webster in household of Charles L Webster, Fredonia, Chautauqua, New York, United States; citing enumeration district ED 66, sheet 532B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0816; FHL microfilm 1,254,816.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS6V-X7S : accessed 5 June 2018), William L Webster in household of Annie Webster, Pomfret Township Fredonia village (northern part), Chautauqua, New York, United States; citing enumeration district (ED) 119, sheet 8A, family 173, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,015.
Find A Grave, database and images (https://www.findagrave.com : accessed 05 June 2018), memorial page for William Luther Webster (15 Oct 1878–Mar 1945), Find A Grave Memorial no. 79880685, citing Forest Hill Cemetery, Fredonia, Chautauqua County, New York, USA ; Maintained by Lanie (contributor 47381115) . No headstone image.