def list(self, **params):
_, _, deal_sources = self.http_client.get("<STR_LIT>", params=params)<EOL>return deal_sources<EOL>
Retrieve all sources

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

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