Harvard

To be made up of:

• Title of game (in italics): edition or version (if available).
• Year (in round brackets).
• Platform.
• Game (in square brackets).
• Place of publication: Publisher

In-text citation:

(The Sims 4, 2014) 

Reference list:

The Sims 4. (2014). PC [Game]. Redwood City, CA: Electronic Arts.