https://es-es.facebook.com/pages/Marianne-Costa/174811162588522
https://plancreateur.wordpress.com/tag/marianne-costa/
http://mariannecosta.com
http://www.babelio.com/auteur/Marianne-Costa/101080
http://www.librairiedialogues.fr/personne/marianne-costa/287958/
http://www.siruela.com/catalogo.php?&id_autor=545
http://mariannecostabologna.blogspot.it