Key references for exoplanet data include the website exoplanets.org, which offers a comprehensive catalog detailing various parameters such as orbital period and mass. This site, associated with Geoff Marcy, also features a specialized search for rocky planets. Another valuable resource is the European site exoplanet.eu, managed by Jean Schneider, which provides a similar catalog of discovered exoplanets. Additionally, Wikipedia has a listing of extrasolar planets, but exoplanets.org is recommended for its direct connection to scientific research. These resources collectively serve as essential tools for anyone seeking detailed exoplanet information.