Seven studios helped develop Call of Duty: Modern Warfare 3 - Xfire

According to the game's Steam page, Sledgehammer Games, Treyarch, Infinity Ward, and four other studios helped with the upcoming installment.

The Full List of Every Call of Duty Game Ever Released - GAMES, BRRRAAAINS & A HEAD-BANGING LIFE

Game Review: Call Of Duty - Advanced Warfare (Xbox One) - GAMES, BRRRAAAINS & A HEAD-BANGING LIFE

Call of Duty: Modern Warfare 3 runs well on PS5 and Series X - but Series S has issues

New Xbox Shooter Crossfire X Is Getting A Beta Very Soon, Store Leak Suggests - GameSpot

The new War Mode map is a combination of Khandor Hideout, Crossfire, and Countdown : r/ModernWarfareIII

Familiar Faces, Maps, and Modes Coming to 'Call of Duty Mobile

CrossfireX is a Throwback for Fans of Modern Warfare

Call of Duty: Modern Warfare 3 (Xbox 360) retrospective

Here's the first trailer for Call of Duty: Infinite Warfare

MWII Announcement: Season 06: The Haunting — Call of Duty: Modern Warfare II — Blizzard News

Xbox Game Studios, OT9

PlayStation 3 - Wikipedia

Call of Duty: Modern Warfare 3 - Seven studios with whom the project began - Game News 24