Sagan, C. (2013). Cosmos (Ballantine Books Trade Paperbacks, 2013.). Ballantine.
芝加哥风格引文Sagan, Carl. Cosmos. Ballantine Books Trade Paperbacks, 2013. New York: Ballantine, 2013.
MLA引文Sagan, Carl. Cosmos. Ballantine Books Trade Paperbacks, 2013. Ballantine, 2013.
警告：这些引文格式不一定是100％准确.