Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990, [page needed] Leigh Rayment's Peerage Pages [self-published source] [better source needed] http://www.westportnow.com/index.php?/v2_5/obitjump/dan_samuel_89/