[S1283] Trask, William B. "Abstracts from the Earliest Wills on Record in the County of Suffolk, Mass", (Boston: The New England Historical and Genealogical Register, volume X, 1856).
[S1195] Plummer, John. "The English Origin of Samuel Bitfield of Boston, Massachusetts", (New Haven, Connecticut: The American Genealogist, Volume LXVII, 1992).