Peterson, Jackie (August 14, 1960). "She Couldn't Carry a Tune But Won Lead in Musical". San Francisco Examiner. p. C2. Retrieved August 16, 2024. "After two years of lessons and long hours of practice, the tutor sent Joan to audition for the San Francisco Opera chorus. Then known as Joan Louise Welton (later, Warner Bros. whimsically changed the 't' to a 'd'), the yet unpolished hopeful auditioned for chorus master Kurt Herbert Adler."
Cook, Ben (January 12, 1953). "Thumbnail Sketch". The Terre Haute Tribune. Indiana, Terre Haute. The Terre Haute Tribune. p. 4. Retrieved March 9, 2016 – via Newspapers.com.
Hopper, Hedda (November 20, 1952). "In Hollywood". Valley Morning Star. Texas, Harlingen. Valley Morning Star. p. 7. Retrieved March 9, 2016 – via Newspapers.com.