def list(self, **params):
        """
        Retrieve all sources

        Returns all lead sources available to the user according to the parameters provided

        :calls: ``get /lead_sources``
        :param dict params: (optional) Search options.
        :return: List of dictionaries that support attriubte-style access, which represent collection of LeadSources.
        :rtype: list
        """

        _, _, lead_sources = self.http_client.get("/lead_sources", params=params)
        return lead_sources