External links
- Heart of the Alien: Out of this World Parts I and II at MobyGames
- Heart of the Alien: Out of this World Parts I and II at GameFAQs
- Heart of the Alien: Out of this World Parts I and II at Sega Retro
- Heart of the Alien at Sega-16
- Heart of the Alien: Out of this World Parts I and II at Hardcore Gaming 101