GTA 4 has some of the DLC of all-time

The DLC That Shook the Gaming World: How Episodes From Liberty City Set the Bar for Future Add-On Content - Softonic

FYI] GTA IV: Ep. from Liberty City DLCs are standalone and can be played with the DLC disc. You can lend the GTA IV disc to a friend or vice-versa. : r/xboxone

Evolution of Grand Theft Auto: Milestones From Every GTA - GameSpot

5 noticeable differences between GTA 4 and the Episodes from Liberty City

Grand Theft Auto IV™

Grand Theft Auto IV - Wikipedia

Grand Theft Auto IV: The Complete Edition, GTA Wiki

Opinion on each GTA 4 protagonist? : r/GTA

Ranking all GTA DLCs released till date