^Don E. Fehrenbacher (1978), The Dred Scott Case, 2001 reprint, New York: Oxford, Part 3, "Consequences and Echoes", Ch. 20, "The Freeport Doctrine", p. 510, (ردمك 978-0-19-514588-5).
^Don E. Fehrenbacher (1978), The Dred Scott Case, 2001 reprint, New York: Oxford, Part 3, "Consequences and Echoes", Ch. 20, "The Freeport Doctrine", p. 508, (ردمك 978-0-19-514588-5).
^Don E. Fehrenbacher (1978), The Dred Scott Case, 2001 reprint, New York: Oxford, Part 2, "A Decade of Litigation", Ch. 12, "Before the Supreme Court", p. Co, (ردمك 978-0-19-514588-5).
