https://www.ilo.org/legacy/english/inwork/cb-policy-guide/declarationofPhiladelphia1944.pdf
https://www.boeckler.de/pdf/p_imk_report_141e_2018.pdf
https://www.hamiltonproject.org/assets/files/UnionsEA_Web_8.19.pdf
https://www.instituteforgovernment.org.uk/sites/default/files/publications/coronavirus-unemployment-five-nation-comparison.pdf