
https://www.boeckler.de/pdf/p_study_hbs_376.pdf

https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef22024en.pdf

https://www.global-counsel.co.uk/sites/default/files/analysis/insight/download/Hard%20and%20Soft%20Political%20Risk.pdf