
https://blogs.lse.ac.uk/europpblog/2021/10/05/how-the-size-of-a-citys-immigrant-population-influences-feelings-of-trust-and-safety-in-urban-europe/

http://www.cbi.org.uk/index.cfm/_api/render/file/?method=inline&fileID=4232B592-ACCC-40DB-9338BA0A97198435

https://www.gainesvilletimes.com/opinion/letter-why-mexico-border-wall-probably-waste-time-money/