Most (if not all) of computer networking manuscripts refer to RFCs as the main source of information.
"The RFC (Request for Comments) series contains technical and organizational documents about the Internet, including the technical specifications and policy documents produced by the Internet Engineering Task Force (IETF)."
--RFC Editor Webpage
If you need a source to get all of the RFCs that you need you can follow the link below:
There are several options that can help you filter search results and you can also choose the format of the document (ASCII+ or PDF).
You may also go to http://ietfreport.isoc.org/ for more resources.
Good luck!
