Duffus, R. L. (1930). Books: Their place in a democracy. Houghton Mifflin company.
芝加哥风格引文Duffus, R. L. Books: Their Place in a Democracy. Boston: Houghton Mifflin company, 1930.
MLA引文Duffus, R. L. Books: Their Place in a Democracy. Houghton Mifflin company, 1930.
警告：这些引文格式不一定是100％准确.