Do grand theft auto games contain references to other rockstar titles?

The only verified information provided concerns Grand Theft Auto III, which was developed by DMA Design and published by Rockstar Games. The description focuses on the game's setting, protagonist, and gameplay mechanics, and does not mention any Easter eggs, references, or cross‑references to other Rockstar titles. Because the evidence contains no mention of cross‑franchise references, we cannot confirm that such references exist in the series. Without additional sources indicating otherwise, the safe conclusion is that Grand Theft Auto games, as described, do not contain references to other Rockstar titles.