The game book includes a selected bibliography (pages 175-176) of secondary and primary sources. If the Minnesota State University, Mankato Library has the title, it is linked below.
Your Faction/Character sheets have a "Learn More" section. If the library has those titles they are listed below. They mostly come from the selected bibliography.
Succession, in General
Secession, in Kentucky
Slavery, in General
Slavery, in Kentucky
Religion
Antebellum Politics, in general
Antebellum Kentucky