Sciences politiques
* http://www.youtube.com/watch?v=U8kOH3qz1Ig
* http://fr.slideshare.net/josimar1305/karl-marx-aula-de-socilogia
* http://www.youtube.com/watch?v=XfyE_wn0XBs
* https://www.youtube.com/watch?v=j6OFsPPiuLM (politique et dictature militaire au Brésil)
* http://www.bbc.com/portuguese/reporterbbc/story/2008/04/080416_anistiafavelasrw.shtml