Obershall, A. (1965). Empirical social research in Germany, 1848-1914. Basic Books.
Lua i Stíl Chicago (17ú heag.)Obershall, Anthony. Empirical Social Research in Germany, 1848-1914. New York: Basic Books, 1965.
Lua MLA (9ú heag.)Obershall, Anthony. Empirical Social Research in Germany, 1848-1914. Basic Books, 1965.
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