APA (7th ed.) Citation

Codd, E. (1990). The relational model for database management: Version 2. Addison-Wesley.

Chicago Style (17th ed.) Citation

Codd, E.F. The Relational Model for Database Management: Version 2. Reading, [etc.]: Addison-Wesley, 1990.

MLA (9th ed.) Citation

Codd, E.F. The Relational Model for Database Management: Version 2. Addison-Wesley, 1990.

Warning: These citations may not always be 100% accurate.