APA-čujuhus (7. p.)
Douglass, F., & Ruffin, G. L. (2001). The life and times of Frederick Douglass. Digital Scanning.
Chicago-čujuhus (17. p.)
Douglass, Frederick, juo George L. Ruffin. The Life and Times of Frederick Douglass. Scituate, Mass.: Digital Scanning, 2001.
MLA-čujuhus (9. p.)
Douglass, Frederick, juo George L. Ruffin. The Life and Times of Frederick Douglass. Digital Scanning, 2001.
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