1. "The migrations of human populations," Scientific American 231, no. 3 (September, 1974), 105.
2. Fuchs, Lawrence H. "Immigrations Reform," Journal of American African-American History (1983), 58-59.
3. Johansen, Donald J. "The beginning of humankind" N.Y. 1981 pp 893-101.
4. Jones, Maldwyn A. "American immigration," Perspectives in American History 7, 1973, 3-92.
5. Curtin, Phillip D. The African Slave Trade: A Census, Madison, WI, 1969.
6. Commission on Immigration and Naturalization. "Whom We Shall Welcome," Washington, D.C., 1952.
7. Tsai, Henry Shih-Shan. The Chinese Experience in America, Bloomington, IN, 1986.