APA引文

(1990). World Almanac: And book of facts. World Almanac.

芝加哥风格引文

World Almanac: And Book of Facts. New york: World Almanac, 1990.

MLA引文

World Almanac: And Book of Facts. World Almanac, 1990.

警告：这些引文格式不一定是100％准确.