https://www.bancaditalia.it/media/approfondimenti/2019/pop-bari/approfondimenti-popBari.pdf
https://www.ftc.gov/system/files/ftc_gov/pdf/pharmacy-benefit-managers-staff-report.pdf
https://www.veblen-institute.org/Editorial-Assumer-l-impot
http://www.resolutionfoundation.org/app/uploads/2017/01/Audit-2017.pdf