Birrell, Andrew D. and Nelson, Bruce Jay; "Implementing Remote Procedure Calls"; XEROX CSL-83-7, October 1983.
Cheriton, D.; "VMTP: Versatile Message Transaction Protocol," Preliminary Version 0.3; Stanford University, January 1987.
Postel, J.; "Transmission Control Protocol - DARPA Internet Program Protocol Specification," RFC 793; Information Sciences Institute, September 1981.
Postel, J.; "User Datagram Protocol," RFC 768; Information Sciences Institute, August 1980.
Reynolds, J. & Postel, J.; "Assigned Numbers," RFC 923; Information Sciences Institute, October 1984.