I know that Wikipedia can provide a quick overview on a topic; however, as a researcher/librarian, I would never suggest to students to add Wikipedia to a list of additional resources. Perhaps some of the referenced resources at the end of the entry might be a better choice.
In general, I would sort the resources related to the commons by "historical/physical" and "contemporary/philosophical". It was confusing to read an article such as this, as well as some of the others that follow that address the physical environment, cow enclosures, land ownership,etc. mixed in with our discussion of the commons as a philosophical concept, related to a more contemporary information society. Of course, I understood the connection from history to present day and it is an interesting and important one; however, I think a little ordering and some subheadings would lead the reader down the right path more seamlessly.