How do I cite a videogame as a resource?

[NewYork_Comedian]

So we are doing a history day project where we can chose a specific event or period of history that was a turning point, or had a lasting effect, in the grand scheme of things. I decided to do a topic that nobody else would think of and went with the Sengoku Jidai because, like an idiot, I thought it would be cool to use Shogun 2 and Civilization 5 as a primary source document in my project. Problem is, I have no idea how I would cite a video game, or how I would use a quote from, say, the Civilopedia, in my report.

So the simple question is: How do I cite a videogame in MLA format?

CAPTCHA: Road less traveled. Yeah, you could say that...

 

[Kopikatsu]

Title of game. Version number. Date of version. Publisher. Date of access.

At least, that's my assumption.

 

[L0dest0ne]

Title of game. Version number. Date of version. Publisher. Date of access.

At least, that's my assumption.

Don't forget developer. They are the author of this "Book."

 

[Terratina.]

like an idiot, I thought it would be cool to use Shogun 2 and Civilization 5 as a primary source document in my project.

Aren't they secondary sources since they were created after the event?