1. Christian Scientist Association: Names – Class of March 4, 1889, EOR05.
  2. Mary Baker Eddy to Helen W. Bingham, 3 August 1888, L04625.
  3. Helen W. Bingham to Calvin A. Frye, 14 April 1897, IC098.21.007.
  4. Eddy to Bingham, 15 April 1897, L04626.
  5. Arthur E. Bingham and Helen W. Bingham purchase “Beach Bluff” property [1625/277 & 279], 10 November 1900, http://salemdeeds.com/salemdeeds/Default2.aspx.