1. Batini, C., Ceri, S., Navathe, S.: Conceptual Database Design. Benjamin/Cummings (1992)
2. Eco, U.: Semiotics and the Philosophy of Language. Indiana Univ. Press (1984)
3. Koch, I.: Introdução à Linguística Textual. WMF Martins Fontes (2009) (in Portuguese)
4. Bechara, E.: Moderna Gramática Portuguesa. Nova Fronteira (2009) (in Portuguese)
5. Bunge, M.: Philosophical Dictionary. Prometheus Books, Amherst (2003)