"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M6FW-8K5), Sylvia B Shepherd in household of William G Shepherd, Union, Putnam, Missouri, United States, 209; citing sheet 535B, film number 0711, NARA microfilm publication T9, National Archives and Records Administration, Washington D.C.; FHL microfilm 1,254,711.
"Missouri, Marriages, 1750-1920," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/V2DQ-HDM), Cyrus Lincoln and Sylvia B. Shepherd, 15 Nov 1885; citing Putnam,Missouri; FHL microfilm 431,522.
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M38Z-D73), Sylvia B Lincoln in household of Cyrus Lincoln, Union Township (excl. Unionville town), Putnam, Missouri, United States; citing sheet 7A, family 127, NARA microfilm publication T623, National Archives and Records Administration, Washington, D.C.; FHL microfilm 1,240,884.
"Iowa, Marriages, 1809-1992," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJBT-2KC), William A. Richardson and Sylvia Belle Shepherd Lincoln, 24 Aug 1918; citing Centerville, reference 2:3R28MBB; FHL microfilm 1,674,115.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M8CR-W14), Belle Richardson, Union, Putnam, Missouri, United States; citing sheet 9B, family 216, NARA microfilm publication T625, National Archives and Records Administration, Washington D.C.; FHL microfilm 1,820,943.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHNN-32H : accessed 4 September 2019), Silvia B Lincoln, Union, Putnam, Missouri, United States; citing enumeration district (ED) ED 13, sheet 2B, line 74, family 54, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1219; FHL microfilm 2,340,954.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K77T-FZ3), Belle S Lincoln, Unionville, Union Township, Putnam, Missouri, United States; citing enumeration district (ED) 86-13, sheet 19A, family 495, NARA digital publication of T627, roll 2142, NARA digital publication of T627, National Archives and Records Administration, Washington, D.C.