Andrew Frank Burghardt: The Political Geography of Burgenland, Washington, D. C. 1958 (= National Academy of Sciences-National Research Council, Publication 587), S. 211f.
Andrew Frank Burghardt: The Political Geography of Burgenland, Washington, D. C. 1958 (= National Academy of Sciences-National Research Council, Publication 587), S. 212, Anm. 66.