Brooke, J. L. (2019). "There Is a North": Fugitive Slaves, Political Crisis, and Cultural Transformation in the Coming of the Civil War. University of Massachusetts Press.
芝加哥风格引文Brooke, John L. "There Is a North": Fugitive Slaves, Political Crisis, and Cultural Transformation in the Coming of the Civil War. Amherst: University of Massachusetts Press, 2019.
MLA引文Brooke, John L. "There Is a North": Fugitive Slaves, Political Crisis, and Cultural Transformation in the Coming of the Civil War. University of Massachusetts Press, 2019.
警告：这些引文格式不一定是100％准确.