"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FH9R-JVW : 5 November 2017), Sewall Desby and Miranda Wood, 20 Nov 1841; citing Marriage, Leominster, Worcester, Massachusetts, United States, , town clerk offices, Massachusetts; FHL microfilm 758,481.
"Massachusetts Deaths and Burials, 1795-1910," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FHGZ-5JF : 10 February 2018), Sewell Derby, 21 May 1888; citing , reference p. 192 no. 57; FHL microfilm 2,313,481.
"Massachusetts Deaths, 1841-1915," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/N4QM-VXY : 11 March 2018), Sewall Derby in entry for Adelia J Brown, 25 Nov 1911; citing Worcester,,Massachusetts, 398, State Archives, Boston; FHL microfilm 2,394,589.
Find A Grave, database and images (https://www.findagrave.com : accessed 31 March 2018), memorial page for Sewall Derby (14 Mar 1819–21 May 1888), Find A Grave: Memorial #44405501, citing Evergreen Cemetery, Leominster, Worcester County, Massachusetts, USA ; Maintained by Patricia Moore (contributor 46891221) .
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVKD-VHY8 : 13 December 2015), Sewall Derby, 1888; Burial, Leominster, Worcester, Massachusetts, United States of America, Evergreen Cemetery; citing record ID 44405501, Find a Grave, http://www.findagrave.com.