Weitere Bezugsquellen für Bücher und Rollenspielprodukte sind die Rollenspiel-Händler Tellurian, NewWorlds,
They are impossible creatures... Their very existence violates the law of nature... Yet they do exist and they walk amongst us. Neos¸ Gammas¸ and¸ strangest of all¸ the Mutts. They are the offspring of unlikely matings between different species of Beta. They combine aspects of their parentage¸ with elements of humanity. The Hybrid SourceBook includes new rules for¸ creating and playing Beta cross-breeds¸ as well as background on Beta culture and the leaders of Beta society and alien animal Betas.