"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FZ8K-7JV : 10 February 2018), Edmund Darby, 28 Sep 1817; citing LEOMINSTER,WORCESTER,MASSACHUSETTS, ; FHL microfilm 0874029 IT 2.
Find A Grave, database and images (https://www.findagrave.com : accessed 27 April 2018), memorial page for Edmund Derby (unknown–9 Jul 1820), Find A Grave: Memorial #122680243, citing Pine Grove Cemetery, Leominster, Worcester County, Massachusetts, USA ; Maintained by Leon Christoforo (contributor 48290935) .