2002. Carta a Marcus Mello sobre seu artigo sobre a Reforma Administrativa.
LETTERS
SOME LETTERS
2001. Carta em que eu falo sobre suas peças teatrais.
1999. Angela Santana. Letter of a friend and colaborator.
1996. Letter to President Fernando Henrique Cardoso analyzing the economic situation, emphasizing that the overvaluation of the real, and recommending its depreciation in order to avoid a financial crisis before reelection. (3.9.1996)
1987. December. Resignation letter from the Ministry.
1977.
1960. Letter identifying the new historical facts that made obsolete ISEB's interpretation of Brazil based on de idea of an alliance between the national bourgeoisie and the left. (East Lansing, 14.12.60)