- https://www.census.gov/popclock/world
- http://www.usnews.com/opinion/blogs/robert-schlesinger/2014/12/31/us-population-2015-320-million-and-world-population-72-billion
- https://esa.un.org/unpd/wpp/Publications/Files/WPP2017_KeyFindings.pdf
- http://www.un.org/esa/population/
- http://data.worldbank.org/indicator/SP.POP.TOTL
- https://population.un.org/wpp/
- https://www.census.gov/data/tables/time-series/demo/international-programs/historical-est-worldpop.html
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