Boman, D. K. (2006). Lincoln's resolute unionist: Hamilton Gamble, Dred Scott dissenter and Missouri's Civil War governor. Louisiana University Press.
Chicago-viite (17. p.)Boman, Dennis K. Lincoln's Resolute Unionist: Hamilton Gamble, Dred Scott Dissenter and Missouri's Civil War Governor. Baton Rouge: Louisiana University Press, 2006.
MLA-viite (9. p.)Boman, Dennis K. Lincoln's Resolute Unionist: Hamilton Gamble, Dred Scott Dissenter and Missouri's Civil War Governor. Louisiana University Press, 2006.
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