La+Comida+10+cite+Tortilla+Española

http://spanishfood.about.com/od/tapas/r/tortilla.htm

https://encrypted.google.com/search?hl=en&biw=1137&bih=614&defl=en&q=define:Tortilla+española&sa=X&ei=UYDkTJe_NMyanAe9mI34BQ&ved=0CBQQkAE

http://www.spainontheroadagain.com/recipe_tortilla.shtml

http://en.wikipedia.org/wiki/Tortilla_de_patatas#History