Fuentes: 

01 https://www.bbc.com/mundo/noticias-42903954

02 https://bit.ly/2uzg1my

03 https://www.timeout.com/newyork/blog/the-javits-center-now-offers-free-tours-of-its-gorgeous-rooftop-garden-050117

04 http://www.guinnessworldrecords.com/world-records/427929-largest-rooftop-garden

05 https://www.theguardian.com/environment/climate-consensus-97-per-cent/2018/jun/25/30-years-later-deniers-are-still-lying-about-hansens-amazing-global-warming-prediction

06 https://www.independent.co.uk/news/science/driven-to-extinction-who-killed-the-dodo-481631.html

07 https://www.theguardian.com/science/2016/nov/22/rare-near-complete-dodo-skeleton-fetches-346300-pounds-auction

08 https://www.cbc.ca/news/technology/oxford-dodo-shot-to-death-1.4626656

09 https://www.stuff.co.nz/science/103723368/newlydiscovered-pigeon-species-related-to-the-dodo-lived-in-nz-millions-of-years-ago

10 https://www.bbc.com/news/science-environment-41002562

11 https://mentalfloss.com/article/52624/11-things-we-know-about-dodo

12 http://www.el-nacional.com/noticias/bbc-mundo/inesperado-hallazgo-una-piramide-mexico-tras-terremoto-2017_243867

13 https://www.livescience.com/62976-ancient-homes-giza-pyramids.html

14 https://www.reuters.com/article/us-egypt-archaeology-discovery/egypt-uncovers-mummy-burial-site-near-great-pyramids-idUSKBN1K40M1

15 https://www.eluniverso.com/noticias/2018/07/13/nota/6855794/recta-final-elaboracion-piramide-rosas-mas-grande-mundo-noticias

16 Williamson, Edwin. Historia de América Latina. FCE, 2014.

17 Williamson, Edwin. Historia de América Latina. FCE, 2014.

18 Williamson, Edwin. Historia de América Latina. FCE, 2014.

19 Williamson, Edwin. Historia de América Latina. FCE, 2014 y https://www.insightcrime.org/news/brief/ex-guatemala-regime-likened-to-organized-crime-syndicate/

20 https://latinamericanpost.com/index.php/latam/19351-el-salvador--homicides-increased-in-the-first-month-of-2018