APA引文

Ketchum, R. What is communism? E.P Dutton & Co. Inc.

芝加哥风格引文

Ketchum, Richard. What Is Communism? New York: E.P Dutton & Co. Inc.

MLA引文

Ketchum, Richard. What Is Communism? E.P Dutton & Co. Inc.

警告：这些引文格式不一定是100％准确.