Metal Gear Solid 4 developer reveals truth about PS3 exclusivity - Xfire

Apparently, Metal Gear Solid 4 could''ve come to the Xbox 360 and there actually existed a working version of the game on the Xbox console.

Official PlayStation Magazine - UK Edition Christmas 2018 (Digital)

Why should you invest in your PlayStation setup without breaking the bank? - Quora

Metal Gear Solid Ran on Xbox 360 & Wasn't Actually Exclusive

PS3 2006 Year in Review - IGN

Metal Gear Solid 4 developer reveals truth about PS3 exclusivity - Xfire

Had to add these photos, since the controller has arrived to finish this bundle! : r/PS3

Rumor: Sony Has Reportedly Struck Exclusivity Deals With Konami for MGS3, Silent Hill, and Castlevania : r/gamernews

News - July, 2013

PlayStation 3 - Wikipedia

Metal Gear Solid 4 LE GameStop-exclusive, gunmetal PS3 NA-bound - GameSpot

Classic PS3 title may receive huge remake on Xbox only