http://personales.ya.com/casanchi/recreativa.htm Divulgamat How Stuff Works
Las Mejores Webs Científicas Scientific American – American Scientific Science and Technology Web Awards 2004 Enciclopedia Vertebrados Ibéricos
http://personales.ya.com/casanchi/recreativa.htmDivulgamatHow Stuff WorksScientific American – American Scientific Science and Technology Web Awards 2004Enciclopedia Vertebrados Ibéricos