Cita APA (7a ed.)
Codd, E. (1990). <The> Relational Model for Database Management: Version 2 (1. ed.). Addison-Wesley Pub. Co.
Cita Chicago Style (17a ed.)
Codd, E.F. <The> Relational Model for Database Management: Version 2. 1. ed. Reading: Addison-Wesley Pub. Co, 1990.
Cita MLA (9a ed.)
Codd, E.F. <The> Relational Model for Database Management: Version 2. 1. ed. Addison-Wesley Pub. Co, 1990.
Precaución: Estas citas no son 100% exactas.