A Game of Thrones: D20-Based Open Gaming RPG by Elissa Carey and George R.R. Martin and Jonathan Cassie and Simone Cooper and Sam Johnson and Wil Upchurch and Christopher Young and Jesse Scoble and Ian Sturrock and Jeremy Zimmerman and Chris Desmarais and Mark Jason Durall and David Lyons and Mark Mackinnon and Debbie Gallagher