These are some links to material describing GraphQL and the ideas behind it.
- The draft GraphQL specification
- Exploring GraphQL, a talk by Lee Byron at react-europe 2015 which first introduced the spec
- Creating a GraphQL Server, also from react-europe 2015
- Demand-Driven Architecture, a presentation by Kovas Boguta and David Nolen at QCon New York 2015
- Reinventing Haxl: Efficient, Concurrent and Concise Data Access, a talk from EuroClojure 2015 about the muse library which provides the data access layer for Galapagos.