ISBN 0-226-20477-4* Fehrenbacher, Don E. "Slavery, Law, and Politics: The Dred Scott Case in Historical Perspective" Oxford University Press, 1981* Fogel, Robert W. "Without Consent or Contract: The Rise and Fall of American Slavery" W.W. Norton, 1989.
ISBN 0-226-20477-4* Fehrenbacher, Don E. "Slavery, Law, and Politics: The Dred Scott Case in Historical Perspective" Oxford University Press, 1981* Fogel, Robert W. "Without Consent or Contract: The Rise and Fall of American Slavery" W.W. Norton, 1989.