Janssen, S. (2022). The world almanac and book of facts 2023. World Almanac Books, New York.
Lua i Stíl Chicago (17ú heag.)Janssen, Sarah. The World Almanac and Book of Facts 2023. New York: World Almanac Books, New York, 2022.
Lua MLA (9ú heag.)Janssen, Sarah. The World Almanac and Book of Facts 2023. World Almanac Books, New York, 2022.
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