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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Conference on Problems of the Deaf and Hard of Hearing Washington, D.C., National Research Council (U.S.). Division of Anthropology and Psychology, و 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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)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.