APA (7th ed.) Citation

Herich, B., & Codd, E. F. The relational model for database management.

Chicago Style (17th ed.) Citation

Herich, B., and E. F. Codd. The Relational Model for Database Management.

MLA (9th ed.) Citation

Herich, B., and E. F. Codd. The Relational Model for Database Management.

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