code: def find(cls, session, resource_id, include=None):
          
          url = session._build_url(cls._resource_path(), resource_id)
          params = build_request_include(include, None)
          process = cls._mk_one(session, include=include)
          return session.get(url, CB.json(200, process), params=params)
docs: Retrieve a single resource.
  
          This should only be called from sub-classes.
  
          Args:
  
              session(Session): The session to find the resource in
  
              resource_id: The ``id`` for the resource to look up
  
          Keyword Args:
  
              include: Resource classes to include
  
          Returns:
  
              Resource: An instance of a resource, or throws a
                :class:`NotFoundError` if the resource can not be found.