http://www.planalto.gov.br/ccivil_03/Leis/L6015.htm
http://www.planalto.gov.br/ccivil_03/Leis/L10169.htm
http://www.planalto.gov.br/ccivil_03/_ato2007-2010/2007/lei/l11441.htm
http://www.planalto.gov.br/ccivil_03/Leis/L8935.htm
http://www.planalto.gov.br/ccivil/leis/L7433.htm
http://www.presidencia.gov.br/legislacao/