APA引文

Janssen, S. (2020). The world almanac and book of facts 2021. World Almanac.

Chicago Style (17th ed.) Citation

Janssen, Sarah. The World Almanac and Book of Facts 2021. New York: World Almanac, 2020.

MLA引文

Janssen, Sarah. The World Almanac and Book of Facts 2021. World Almanac, 2020.

警告：這些引文格式不一定是100％准確.