• Rio de Janeiro National Library;
• Mozart de Araújo collection; 
• Young Callado, extracted from: SIQUEIRA, Batista: Three historical figures of the Brazilian music - a biographical essay - Mesquita, Callado, Anacleto. Rio de Janeiro: D. Araújo, 1970, p. 93; 
• Joaquim Callado, by Riazi, extracted from: DINIZ, André: Joaquim Callado: The father of chorões. Rio de Janeiro: Arte e Fato, 2002, p. 7;
• André Diniz and Diogo Machado da Cunha: special thanks for the significant participation in this project; and
• Photos of André Diniz collection.