"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMRR-5JX : 22 January 2015), Guy E. Darling in household of Ned E. Darling, Lehi Precinct Lehi city Ward 1-3, Utah, Utah, United States; citing sheet 5B, family 99, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,687.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M5X6-CX3 : 29 October 2015), Guy Darling in household of Ned E Darling, Lehi Ward 1, Utah, Utah, United States; citing enumeration district (ED) ED 190, sheet 4A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,622.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8P2-229 : 14 December 2015), Guy Darling, American Fork Ward 3, Utah, Utah, United States; citing sheet 12B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,868.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VT4C-WFC : accessed 9 November 2016), Guy D Darling, Lehi, Lehi Election Precinct, Utah, Utah, United States; citing enumeration district (ED) 25-23, sheet 5A, family 80, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 4219.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:29J9-RTY : 12 December 2014), Guy Aaron Darling, 1917-1918; citing Utah County, Utah, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,984,056.