Unclear licensing #7
Description
Some of the licenses you indicate for works in this repo are unclear - for example, SICP is listed as 'cc-sa', which is not a license. Additionally, you don't indicate license version, which is pretty important - CC-BY-SA-4.0 and CC-BY-SA-3.0-DE are different in nature.
It would be better if you linked to a description of the license something bears, kinda how I did it in awesome-gamedev.