"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:F4V2-7KS : 5 November 2017), Amasa Lothrop, 31 Dec 1820; citing Birth, Millbury, Worcester, Massachusetts, United States, Massachusetts Secretary of the Commonwealth, Boston; FHL microfilm 007009544.
"Massachusetts Marriages, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N4QL-FJL : 24 May 2018), Amasa H. Luthrop and Eliza W. Bullard, 16 Sep 1846; citing Nantucket, Nantucket, Massachusetts, United States, State Archives, Boston; FHL microfilm 1,428,256.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD91-257 : 12 April 2016), Amasa H Lathrop in household of James Bullard, Sherburne, Middlesex, Massachusetts, United States; citing family 173, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHFC-WV3 : 14 August 2017), Amasa Lathrop, Worcester, Worcester, Massachusetts, United States; citing enumeration district ED 902, sheet 580A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,568.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9BD-CS1 : accessed 16 October 2019), Amos H Lathrop, Precinct 3 Worcester city Ward 6, Worcester, Massachusetts, United States; citing enumeration district (ED) 1762, sheet 9A, family 174, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,697.
"Massachusetts Deaths, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:NWPX-Q25 : 22 May 2019), Amasa H. Lathrop, 21 Aug 1904; citing Worcester, Massachusetts, v 102 p 124, State Archives, Boston; FHL microfilm 2,070,049.
Find A Grave, database and images (https://www.findagrave.com : accessed 16 October 2019), memorial page for Amasa H. Lathrop, II (unknown–21 Aug 1904), Find A Grave: Memorial #144110085, citing Pine Hill Cemetery, Sherborn, Middlesex County, Massachusetts, USA ; Maintained by SCC (contributor 48705959) .