1. Historical Aspects of the Immigration Problem;Abbott,1969
2. Before the Mayflower: A History of Black America;Bennett,1982
3. Black Families in White America;Billingsley,1968
4. Statistics of the education of Negroes, 1929–30; 1931–32;Blose,1936
5. Influence of the social environment on psychopathology: the historical perspective;Brenner,1979