https://www.crisisgroup.org/latin-america-caribbean/andes/venezuela/seeking-best-skewed-poll-hard-choices-venezuela
https://www.brookings.edu/wp-content/uploads/2021/12/Democracy-Playbook-2021_10-Commitments-for-Advancing-Democracy.pdf
https://scholar.princeton.edu/sites/default/files/mgilens/files/gilens_and_page_2014_-testing_theories_of_american_politics.doc.pdf