Landessportbund Nordrhein-Westfalen e. V. Julkaistu 2010 “...management and organisation of sport...”
Landessportbund Nordrhein-Westfalen e. V. Julkaistu 2012 “...management and organisation of sport...”
Landessportbund Nordrhein-Westfalen e. V. Julkaistu 2009 “...management and organisation of sport...”