(2001). The world almanac and book of facts 2001. World Almanac Books.
芝加哥风格引文The World Almanac and Book of Facts 2001. New Jersey: World Almanac Books, 2001.
MLA引文The World Almanac and Book of Facts 2001. World Almanac Books, 2001.
警告：这些引文格式不一定是100％准确.