http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6460&CESifoWP.search=+
https://www.opendemocracy.net/en/beyond-trafficking-and-slavery/exploitation-rule-not-exception/
https://facesofconflict.crisisgroup.org/atrapados-en-el-tapon-migrantes-y-traficantes-en-el-darien/?lang=es