
https://www.crisisgroup.org/latin-america-caribbean/andes/venezuela/seeking-best-skewed-poll-hard-choices-venezuela

https://scholar.princeton.edu/sites/default/files/mgilens/files/gilens_and_page_2014_-testing_theories_of_american_politics.doc.pdf

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/60641/cabinet-manual.pdf