How common are cross references in rockstar games titles?

The only verified information available concerns Grand Theft Auto III, a 2001 action‑adventure game developed by DMA Design and published by Rockstar Games. The description focuses on its setting, gameplay mechanics, and narrative, but it does not refer to any cross references to other Rockstar titles or external media. Because no other Rockstar games are discussed in the source, there is no evidence to assess how common cross references are across Rockstar’s catalogue. Without additional documentation, any statement about the prevalence of cross references would be speculative and is therefore omitted.