Brownson, Lydia B. (Phinney) and Maclean W. McLean, "Lt. John and Elizabeth (Freeman) Ellis of Sandwich, Mass.," New England Historical and Genealogical Register 119, 1965, 161-73, 260-275; 120, 1966, 26-38, 97-122, 187-202. Errata 125, 1971, p. 140.