http://www.dw.com/en/eastern-european-migrants-in-the-uk-face-growing-hostility/a-19562199
http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6441&CESifoWP.search=+
https://committees.parliament.uk/oralevidence/2766/pdf/
https://www.llri.lt/wp-content/uploads/2018/06/Labour-Migration_3.pdf