"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FCWS-8WL : 4 December 2014), Hellen Whittemore, 29 Jul 1786; citing ARLINGTON,MIDDLESEX,MASSACHUSETTS, ; FHL microfilm 0874026 IT 2.
"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FCWS-8WP : 4 December 2014), Hellen Whittemore, 21 Apr 1788; citing ARLINGTON,MIDDLESEX,MASSACHUSETTS, ; FHL microfilm 0874026 IT 2.
"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FHWN-RZF : 5 November 2017), Jonas Prentice and Helen Whittemore, 02 Jan 1807; citing Marriage Notice, Cambridge, Middlesex, Massachusetts, United States, , town clerk offices, Massachusetts; FHL microfilm 893,860.
"Massachusetts Marriages, 1695-1910," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FCWK-M5F : 4 December 2014), Jonas Prentice and Helen Whittemore, 02 Jan 1807; citing reference ; FHL microfilm 496,864.
"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VQXN-FVC : 4 December 2014), Ellen in entry for Jonas Whittemore Prentiss, ; citing , ; FHL microfilm 496,864.
"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VQXN-CBW : 4 December 2014), Ellen in entry for Henry Prentiss, ; citing , ; FHL microfilm 496,864.
"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FHGN-RVT : 18 October 2017), Helen Whittemore in entry for Jonas W. Prentiss and Elizabeth Sargent Tuttle, 14 Oct 1866; citing Marriage, Charlestown, Suffolk, Massachusetts, United States, , town clerk offices, Massachusetts; FHL microfilm 740,994.
"Massachusetts Deaths, 1841-1915," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/NW29-6D9 : 10 December 2014), Helen in entry for Henry Prentiss, 08 Jul 1880; citing Boston, Massachusetts, v 321 p 159, State Archives, Boston; FHL microfilm 960,219.
"Massachusetts Deaths and Burials, 1795-1910," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FHHJ-F3N : 10 December 2014), Helen in entry for Jonas W. Prentiss, 09 Sep 1883; citing , reference #6892; FHL microfilm 593,734.
"Massachusetts Deaths, 1841-1915," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/N7BJ-ZGM : 10 December 2014), Helen Whittemore in entry for Lititia W. Morse, 04 Jun 1895; citing Cambridge, Massachusetts, v 455 p 123, State Archives, Boston; FHL microfilm 961,516.