I think it is preferable to include the material itself, rather than links to that material.
If you are going to include copyrighted material (e.g. NOT public domain material like cases, statutes, etc.) see if you can get permission from the copyright owner. I think it will be best if we all attempt to do our own copyright clearances initially. If you find you are having trouble getting permission, then contact Lydia. There are limited funds in the grant budget to pay for some permission fees. Hopefully most of the material we will be using the copyright owners will let us use gratis (perhaps on the condition that we include a link back to the copyright owner's homepage).
If you want to include links to material, obviously that would be fine, but recognize the risk in having a dead link in your module. Sometimes, linking to another site within the reading material will be unavoidable and entirely appropriate. For example, if you want the students to "explore" a site to see how an entity or site functions, etc. If all you are doing is linking to "straight" reading material, I think we should copy it directly into the module and if it is copyrightable material, we should try to get permission to copy it.