20th century

== Further reading ==
* Brower, Daniel R. and Thomas Sanders. ''The World in the Twentieth Century'' (7th Ed, 2013)
* CBS News. [https://books.google.com/books?id=wO3qlZr7s3MC ''People of the century'']. Simon and Schuster, 1999. {{ISBN|0-684-87093-2}}
* Grenville, J. A. S. ''A History of the World in the Twentieth Century'' (1994). [https://archive.org/details/historyofworldin00gren online free]
* Hallock, Stephanie A. ''The World in the 20th Century: A Thematic Approach'' (2012)
* Langer, William. ''An Encyclopedia of World History'' (5th ed. 1973); highly detailed outline of events [https://archive.org/details/encyclopediaofwo00lang online free]
* Morris, Richard B. and Graham W. Irwin, eds. ''Harper Encyclopedia of the Modern World: A Concise Reference History from 1760 to the Present'' (1970) [https://archive.org/details/harperencycloped00morr online]
* Pindyck, Robert S. "What we know and don't know about climate change, and implications for policy." ''Environmental and Energy Policy and the Economy'' 2.1 (2021): 4–43. [https://www.nber.org/system/files/chapters/c14502/c14502.pdf online]
* Pollard, Sidney, ed. ''Wealth and Poverty: an Economic History of the 20th Century'' (1990), 260 pp; global perspective [https://archive.org/details/wealthpovertyeco00poll online free]
* Stearns, Peter, ed. ''The Encyclopedia of World History'' (2001)
* {{cite encyclopedia | title=The Twentieth Century | author=UNESCO| encyclopedia=History of Humanity| volume=VII | pages = 600 | publisher=[[Routledge]]| date=February 28, 2008 | isbn = 978-0-415-09311-8| author-link=UNESCO |ref=none}}