Douglass, F., & Ruffin, G. L. (2001). The life and times of Frederick Douglass. Digital Scanning.
芝加哥风格引文Douglass, Frederick, 与 George L. Ruffin. The Life and Times of Frederick Douglass. Scituate, Mass.: Digital Scanning, 2001.
MLA引文Douglass, Frederick, 与 George L. Ruffin. The Life and Times of Frederick Douglass. Digital Scanning, 2001.
警告：这些引文格式不一定是100％准确.