USCS Fed Rules App Proc R 4 (c)(1)(A)(i)(ii)(B)()() (1) If an institution has a system designed for legal mail, an inmate confined there must use that system to receive the benefit of this Rule 4(c)(1). If an inmate files a notice of appeal in either a civil or a criminal case, the notice is timely if it is deposited in the institution's internal mail system on or before the last day for filing. what would be a good secondary source in law to use for this legal issue