Anon (1995). "Sir Richard Roberts FRS". London: Royal Society. Diarkibkan daripada yang asal pada 2015-10-06. One or more of the preceding sentences incorporates text from the royalsociety.org website where:
web.archive.org
Anon (1995). "Sir Richard Roberts FRS". London: Royal Society. Diarkibkan daripada yang asal pada 2015-10-06. One or more of the preceding sentences incorporates text from the royalsociety.org website where: