Ecco the Dolphin: Defender of the Future (2000) - MobyGames
Ecco the Dolphin Review - GameSpot
PGA Tour Golf II (found build of HeartBeat Catalyst version of Sega Genesis golf game; 1995) - The Lost Media Wiki
Ecco The Dolphin for Sega Dreamcast - Sales, Wiki, Release Dates, Review, Cheats, Walkthrough
Preservationist unearths early build of canceled Ecco the Dolphin sequel for Dreamcast - Polygon
Sega Dolphin Denmark, SAVE 34%
Ecco the Dolphin (Video Game 1993) - IMDb
Tara, Ecco The Dolphin Wiki
Ecco the Dolphin/Welcome to the Machine — StrategyWiki