Krewson, M. B. (1986). Berlin: 750 Years: A selective Bibliography. Library of Congress.
Lua i Stíl Chicago (17ú heag.)Krewson, Margrit B. Berlin: 750 Years: A Selective Bibliography. Washington, D.C.: Library of Congress, 1986.
Lua MLA (8ú heag.)Krewson, Margrit B. Berlin: 750 Years: A Selective Bibliography. Library of Congress, 1986.
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