Add citation extension.
I often use mindmup to keep research notes. It would be great if we could label each node with the source that it comes from, in some easy way.
what would you expect more than just using a link or attachment for that? See http://blog.mindmup.com/p/working-with-attachments.html and http://blog.mindmup.com/2013/03/hyperlinks-in-nodes.html
Saul Shanabrook commented
Well I usually have many nodes reference one source, so it would be a pain to make a hyperlink for every single one to the same source.
In the past I have created a color code system, so that different colors correspond to different sources, as you can see from this map: https://atlas.mindmup.com/2015/02/973de34099f90132815b2a5760f52650/oil_embargo/index.html