Butler, Elmer Ellsworth, Butlers and Kinsfolk: Butlers of New England and Nova Scotia and related families of other names, including Durkees, descendants of Lieut. William and Sarah (Cross) Butler of Ipswich, Mass., and of Eleazer 1st and Lydia (Durkee) Butler of Ashford, Conn. and Yarmouth, N.S., Milford, NH, Cabinet Press, 1988. Online: Ancestry.com.