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Die politischen Probleme des Weltkrieges
Kjellén, Rudolf, (1916)
Weltpolitische Entwicklungsstufen 1895-1914
Hashagen, Justus, (1916)
These eventful Years : the twentieth century in the making as told by many of its makers : In two vol.
(1924)
Employment Effects of the 2002 Winter Olympics in Salt Lake City, Utah
Baumann, Robert, (2012)
Der Jugendtourismus : seine Institutionen und Organisationen ; (unter besonderer Berücksichtigung schweizerischer Verhältnisse)
Baumann, Robert, (1964)
Rejecting "conventional" wisdom: estimating the economic impact of national political conventions
Baade, Robert A., (2009)