Conference on Problems of the Deaf and Hard of Hearing Washington, D.C., National Research Council (U.S.). Division of Anthropology and Psychology, & National Research Council (U.S.). (1929). Research recommendations of the second Conference on Problems of the Deaf and Hard of Hearing, Washington, D.C., February 1 and 2, 1929. Division of Anthropology and Psychology of the National Research Council.
Lua i Stíl Chicago (17ú heag.)Conference on Problems of the Deaf and Hard of Hearing Washington, D.C., National Research Council (U.S.). Division of Anthropology and Psychology, agus National Research Council (U.S.). Research Recommendations of the Second Conference on Problems of the Deaf and Hard of Hearing, Washington, D.C., February 1 and 2, 1929. Washington, D.C.: Division of Anthropology and Psychology of the National Research Council, 1929.
Lua MLA (9ú heag.)Conference on Problems of the Deaf and Hard of Hearing Washington, D.C., et al. Research Recommendations of the Second Conference on Problems of the Deaf and Hard of Hearing, Washington, D.C., February 1 and 2, 1929. Division of Anthropology and Psychology of the National Research Council, 1929.