APA (7th ed.) Citation

Codemasters (Firm). (2007). Overlord. Codemasters.

Chicago Style (17th ed.) Citation

Codemasters (Firm). Overlord. [England?]: Codemasters, 2007.

MLA (9th ed.) Citation

Codemasters (Firm). Overlord. Codemasters, 2007.

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