VoelkerElsie S.VoelkerC.H.: Spasmophemia in Dyslalia Cophotica. Annals of Otology, Rhinology and Laryngology, 46:3, 740–43 (Sept.), 1937.
2.
American Schools for the Deaf, Tabular Statement. American Annals of the Deaf, 83:1, page 8 (Jan.), 1938.
3.
WestRobert: The Rehabilitation of Speech, page 58. West, Kennedy and Carr. Published by Harpers, 1937.
4.
White House Conference on Child Health and Protection, Special Education, Report of the Committee on Special Classes. D. Appleton-Century Company, Inc., New York, 1931. Chapter on “The Child Defective in Speech.”