Wikipedia and Wikidata help discover entities and references. IQ Caddy reviews and cites the original source wherever possible. Inclusion does not imply that a source endorses this atlas.
National Institute of Standards and Technology · 2013 · Accessed 2026-08-11
United States government work (public domain in the U.S.). NIST-authored material is not subject to U.S. copyright; attribution is requested.
National Center for Education Statistics · 2024 · Accessed 2026-08-11
United States government work (public domain in the U.S.). NCES content produced by federal employees is generally public domain; cited third-party material can differ.
National Center for Education Statistics · 2020 · Accessed 2026-08-11
United States government work; underlying PIAAC terms apply. The U.S. estimates and site are federal products; users should retain OECD/PIAAC attribution where identified.
United States Census Bureau · 2024 · Accessed 2026-08-11
United States government work (public domain in the U.S.). Census Bureau data are free to use with source attribution; logos and third-party content are excluded.
Journal of Intelligence (MDPI) · 2022 · Accessed 2026-08-11
Creative Commons Attribution 4.0 International. Attribution must identify Bryan J. Pesta, the article, journal, year, and DOI.
World Bank · 2021 · Accessed 2026-08-11
Creative Commons Attribution 4.0 International. Use is subject to the license shown for the specific catalog resource and World Bank dataset terms.
World Bank · 2024 · Accessed 2026-08-11
Creative Commons Attribution 4.0 International. Use is subject to the license shown for the selected release; estimates combine learning and schooling inputs.
World Bank · 2026 · Accessed 2026-08-11
Creative Commons Attribution 4.0 International (dataset). The data catalog asset license governs the dataset; related publications can carry CC BY-NC 3.0 IGO.
UNESCO Institute for Statistics · 2025 · Accessed 2026-08-11
Creative Commons Attribution-ShareAlike 3.0 IGO. Retain UNESCO-UIS attribution, indicate changes, and follow the license and platform terms for the selected release.
Nobel Foundation · 2026 · Accessed 2026-08-11
Creative Commons Zero 1.0 Universal. The Nobel API services are free to use under CC0 subject to their service terms.
Wikimedia Foundation · 2026 · Accessed 2026-08-11
Creative Commons Zero 1.0 Universal. Structured Wikidata statements are released under CC0; referenced external sources retain their own rights.
National Archives and Records Administration · 2026 · Accessed 2026-08-11
Public domain metadata; item-level rights vary. Catalog metadata is generally a U.S. government work. Check each archival item's use restrictions and include NARA's API non-endorsement notice when applicable.
Library of Congress · 2026 · Accessed 2026-08-11
Item-level rights vary. The Library does not grant a blanket license for collection items; inspect each Rights and Access statement.
Political Psychology (Wiley) · 2006 · Accessed 2026-08-11
All rights reserved. Only factual citations and a small curated set of reported estimates are represented; the article is not redistributed.
Russell T. Warne · 2023 · Accessed 2026-08-11
All rights reserved. Cited as analysis; no article text or media is redistributed.
Full Fact · 2025 · Accessed 2026-08-11
All rights reserved. The verdict is cited and summarized; Full Fact text and graphics are not redistributed.
Mensa International · 2026 · Accessed 2026-08-11
All rights reserved. Policy is cited for percentile context; test content and proprietary conversion tables are excluded.
American Association on Intellectual and Developmental Disabilities · 2021 · Accessed 2026-08-11
All rights reserved. Guidance is cited to explain that diagnosis requires adaptive-behavior and developmental-context evidence, not an IQ number alone.