oct 27, 2017 - References

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Beall , A. (2016, September). Mailonline. Retrieved from http://www.dailymail.co.uk/sciencetech/article-3810182/Will-mankind-leave-Earth-Stephen-Hawking-warns-human-race-no-future-doesn-t-space.html

Britannica Encyclopedia. (2017). Britannica Encyclopedia. Retrieved from https://www.britannica.com/event/Paleolithic-Period

English Oxford living dictionary. (s/f). English Oxford living dictionary. Retrieved from https://en.oxforddictionaries.com/definition/post-classical

Gill, N. (2017). ThoughtCo. Obtenido de https://www.thoughtco.com/what-is-ancient-classical-history-117286

Mr. Curdjo´s World History. (s/f). Mr. Curdjo´s World History. Retrieved from http://mrcsworldhistory.weebly.com/post-classical.html

Ocaña, J. (2005). Historias siglo 20. Retrieved from http://www.historiasiglo20.org/prehistory/
Wikipedia. (2017). Wikipedia. Retrieved from https://en.wikipedia.org/wiki/Ancient_history

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