1. Observations on an ethnic classification of idiots;Down;Lond Hosp Clin Lea Rep,1866
2. Kalmuc idiocy;Fraser;J Ment Sci,1876
3. Notes on Kalmuc idiocy;Mitchell;J Ment Sci,1876
4. Idiocy and imbecility;Ireland,1887
5. A history of the care and study of the mentally retarded;Kanner,1964