Madeleine Grynsztejn, Ellsworth Kelly, Julian Myers, San Francisco Museum of Modern Art (2002). “Ellsworth Kelly in San Francisco”, p.9, Univ of California Press
James Madison (1836). “The Debates in the Several State Conventions on the Adoption of the Federal Constitution: As Recommended by the General Convention at Philadelphia in 1787. Together with the Journal of the Federal Convention, Luther Martin's Letter, Yates's Minutes, Congressional Opinions, Virginia and Kentucky Resolutions of '98-'99, and Other Illustrations of the Constitution”, p.431