APA-ийн эшлэл(7 дахь хэвлэлт)
Griffler, K. P. (2010). Front line of freedom: African Americans and the forging of the Underground Railroad in the Ohio Valley (Paperback edition.). The University Press of Kentucky.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Griffler, Keith P. Front Line of Freedom: African Americans and the Forging of the Underground Railroad in the Ohio Valley. Paperback edition. Lexington, Kentucky: The University Press of Kentucky, 2010.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Griffler, Keith P. Front Line of Freedom: African Americans and the Forging of the Underground Railroad in the Ohio Valley. Paperback edition. The University Press of Kentucky, 2010.
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