The underlying git references on a Github repo, exposed for the world to see. The git internals documentation will also prove handy for understanding these. API documentation at http://developer.github.com/v3/git/refs/.
A single reference by the ref name.
reference "mike-burns" "github" "heads/master"
The history of references for a repo.
references "mike-burns" "github"
Limited references by a namespace.
namespacedReferences "thoughtbot" "paperclip" "tags"