1. A.T. Kearney 2010 . The A.T. Kearny EU Football Sustainability Study: Is European football to popular to fail? Düsseldorf : A.T. Kearney . Retrieved fromhttp://www.atkearney.de/content/misc/wrapper.php/id/51071/name/pdf_eu_football_sustainability_study_final_net_1277724063f532.pdf
2. French Football
3. Spanish Football
4. Barajas , A. , Fernández-Jardón , C. & Crolley , L. 2010 . Does sports performance influence revenues and economic results ind Spanish Football? München : Working Paper: MPRA . Retrieved fromhttp://mpra.ub.uni-muenchen.de/3234/