Ludwig, E., Paul, E., & Paul, C. (1930). Lincoln. Lincoln History Society.
芝加哥风格引文Ludwig, Emil, Eden Paul, 与 Cedar Paul. Lincoln. New York: Lincoln History Society, 1930.
MLA引文Ludwig, Emil, et al. Lincoln. Lincoln History Society, 1930.
警告：这些引文格式不一定是100％准确.