1. Fanny T. Barrett, testimony, Christian Science Sentinel, 27 July 1935, 964-965, https://sentinel.christianscience.com/issues/1935/7/37-48/many-years-ago-christian-science-was-brought-to-my
  2. Harold Winthrop Martin, “A History of The American Guild of Organists in Boston Massachusetts (1905–1954)” (master’s thesis, Union Theological Seminary, 1954), ch. XVII.
  3. “Organists’ Open Meeting,” The Washington Heights Music Club, advertisement, The Christian Science Monitor, 8 May 1923, 2.
  4. For the current standards for this certification, see “AGO Associateship Certification,” The American Guild of Organists, accessed 18 February 2020, https://www.agohq.org/associateship-certification/ “AGO Certification,” The American Guild of Organists, accessed 18 February 2020, https://www.agohq.org/certification/
  5. “The Examinations,” Notes and Reviews, The American Organist 5, no. 4 (April 1922), 145. https://books.google.com/books?id=GpZFAQAAMAAJ&lpg=PA145&ots=8wG-qEdF72&dq=society%20theatre%20organist%20barrett&pg=PA145#v=onepage&q=society%20theatre%20organist%20barrett&f=false
  6. Ruth Barrett Arno, testimony, Sentinel, 5 July 1941, 875-876, https://sentinel.christianscience.com/issues/1941/7/43-44/it-is-with-deep-gratitude-that-i-offer-my-testimony-of
  7. In Boston, it was broadcast on WAAB. Lloyd C. Greene, “Radio Broadcasts,” Boston Globe 27 May 1933, 15.
  8. “Organists, TMC” and “Organists in The Mother Church” circa 1972, The First Church of Christ, Scientist – Music – Organists and Soloists, Subject File Box 197.
  9. Martin, “A History of The American Guild of Organists in Boston Massachusetts (1905–1954),” ch. XVII.
  10. Ruth Barrett Arno, “Our Musical Standard,” Sentinel, 11 July 1936, 900, https://sentinel.christianscience.com/issues/1936/7/38-45/general-activities-meeting-of-the-mother-church
  11. Ruth Barrett Arno, The Sacred Hour at the Piano (New York: Carl Fischer, 1943)
  12. Ruth Barrett Phelps, Second Volume of The Sacred Hour at the Organ (New York: Carl Fischer, 1953)
  13. “Mrs. Arno to Give Recitals Over Air,” Monitor, 10 September 1947, 4.
  14. “AGO History—Past Deans’ List,” The American Guild of Organists, accessed 18 February 2020, http://www.bostonago.org/chapter/history-past-deans-list/
  15. Martin, “A History,” ch. XVII.
  16. “Organist Guild Told Need For Choral Music,” Monitor, 23 June 1950, 1.
  17. “Organists Consider Methods to Boost Salaries, Prestige,” Boston Herald, 21 June 1950.
  18. “Pay for Music Stirs Organists’ Discord,” Canton Repository, 25 June 1950.
  19. Burton K. Tidwell, Lawrence Phelps, Organ Builder (Richmond, Virginia: The Organ Historical Society, 2015), 7-8. Tidwell, “The Organ at The First Church of Christ, Scientist: The Mother Church,” The Tracker: Journal of the Organ Historical Society, Vol. 44, No. 1 (January 2000), 34–40. Lawrence Phelps, “Great Organ Placed in C. S. Mother Church,” Diapason, No. 8 (1 July 1952),1, 2, 13.
  20. “Mother Church Introduces Rebuilt, Vastly Larger Organ, With 13,389 Pipes,” Monitor, 4 June 1952, 6.
  21. Ruth Barrett Phelps, Anthology of Organ Music (New York: Carl Fischer, 1966).