Batman vs Superman Sources List

Sources:
https://moviepilot.com/p/who-was-the-first-comic-book-superhero/4107103

https://comicvine.gamespot.com/forums/gen-discussion-1/who-makes-more-money-batman-or-superman-704247/
https://www.hollywoodreporter.com/heat-vision/best-selling-comics-2017-1070490
https://www.cbr.com/dc-comics-greatest-events-ever/
https://www.thoughtco.com/top-dc-comics-book-superhero-characters-804276
http://www.comichron.com/monthlycomicssales/2017.html
https://www.quora.com/Who-makes-more-comic-sales-Superman-or-Batman-How-much-is-the-difference-annually
https://www.zapkapowcomics.com/top-10-best-selling-comic-books
http://www.comichron.com/faq/alltimebestsellingcomicbook.html
http://www.boxofficemojo.com/genres/chart/?id=superhero.htm
http://www.businessinsider.com/highest-grossing-superhero-franchises-in-the-us-2017-7/#4-superman-1970-034-900-total-grossed-7
https://editorial.rottentomatoes.com/guide/50-best-superhero-movies-of-all-time/5/
http://www.metacritic.com/movie/the-dark-knight/critic-reviews?dist=neutral
https://www.thoughtco.com/top-times-superman-beat-up-batman-3152428
https://www.reddit.com/r/comicbooks/comments/33a36w/so_how_many_times_have_superman_and_batman_fought/
https://screenrant.com/best-batman-vs-superman-fights-dc-comic-books/
http://worldversus.com/Batman-vs-Superman
http://comicbook.com/2016/03/25/who-wins-the-fight-between-batman-and-superman-in-dawn-of-justic/
https://en.wikipedia.org/wiki/List_of_Homeric_characters
https://en.wikipedia.org/wiki/List_of_superhero_debuts
https://en.wikipedia.org/wiki/Zorro
https://en.wikipedia.org/wiki/Superman
https://en.wikipedia.org/wiki/Batman