(9) Parmelee, Maurice. Poverty and Social Progress. New York, 1916.
(10) Gillin, John L. Poverty and Dependency. Their relief and prevention. New York, 1921.
(11) Sombart, Werner. Das Proletariat; Bilder und Studien. Frankfurt am Main, 1906.
(12) Riis, Jacob A. How the Other Half Lives. Studies among the tenements of New York. New York, 1890.
(13) Nevinson, Margaret W. Workhouse Characters and Other Sketches of the Life of the Poor. London, 1918.
(14) Sims, George R. How the Poor Live; and Horrible London. London, 1898.
C. The Industrially Handicapped
(1) Best, Harry. The Deaf. Their position in society and the provision for their education in the United States. New York, 1914.
(2) ——. The Blind. Their condition and the work being done for them in the United States. New York, 1919.
(3) United States Bureau of the Census. The Blind and the Deaf, 1900. Washington, 1906.