Luke
The "law" in the US is governed by the CFR (Code of Federal Regulations) which cover many areas of which the FAR's are part of Title 14 - Aeronautics and Space
The FAR's from part 1 to Part 199 cover everything in aviation from certification of aircraft and parts, markings,licences and all operational requirements.
There are many "Advisory" publications and even "handbooks" which purport to explain things but in the end the FAR is the law.
Try
http://www.faa.gov/aviation.htm