Greenberg. The Worlds of James Buchanan and Thaddeus Stevens. Louisiana State University Press.
芝加哥风格引文Greenberg. The Worlds of James Buchanan and Thaddeus Stevens. Louisiana State University Press.
MLA引文Greenberg. The Worlds of James Buchanan and Thaddeus Stevens. Louisiana State University Press.
警告：这些引文格式不一定是100％准确.