Nicolay, H. (2006). Personal Traits of Abraham Lincoln. Stackpole Books.
芝加哥风格引文Nicolay, Helen. Personal Traits of Abraham Lincoln. Mechanicsb urg: Stackpole Books, 2006.
MLA引文Nicolay, Helen. Personal Traits of Abraham Lincoln. Stackpole Books, 2006.
警告：这些引文格式不一定是100％准确.