https://www.socialeurope.eu/marrying-labour-flexibility-protection
https://www.instituteforgovernment.org.uk/sites/default/files/publications/International-civil-service-effectiveness-index-July-17.pdf
https://www.transparency.de/fileadmin/Redaktion/Publikationen/2019/19-09-01_TI-D_Gutachten_Momsen.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/662744/State_of_the_Nation_2017_-_Social_Mobility_in_Great_Britain.pdf