From my review of the forum posts, I do not think there is any mention of adding citations for a point analysis.
When creating a point for a service, I believe the Analysis section is to comment on why the quote from the document is in the document. To strengthen my explanation, I would like to cite a source. For example, for the service Red Pocket which does not guarantee service, I would like to cite what an MVNO is as a service reseller to help explain the statement for those interested. This will allow an interested reader to learn more about a service and whether the ToS are in line with other similar services.
I do not think there has to be any built-in system, just wondering if there was some standard to show where information came from. For now I just put the relevant website in parenthesis.