DeWitt, N. (1961). Education and professional employment in the U.S.S.R. Prepared for the National Science Foundation by the Office of Scientific Personnel, National Academy of Sciences-National Research Council. National Science Foundation.

DeWitt, Nicholas. Education and Professional Employment in the U.S.S.R. Prepared for the National Science Foundation by the Office of Scientific Personnel, National Academy of Sciences-National Research Council. [Washington]: National Science Foundation, 1961.

DeWitt, Nicholas. Education and Professional Employment in the U.S.S.R. Prepared for the National Science Foundation by the Office of Scientific Personnel, National Academy of Sciences-National Research Council. National Science Foundation, 1961.