Dispositions, 1996 CIP t.p. (D.M. Armstrong) data sheet (7/8/26)
678 field information, July 9, 2014 (b. 1926)
Telegraph (online), viewed July 9, 2014 (Professor David Armstrong; b. David Malet Armstrong, July 8, 1926, Melbourne; d. May 13, 2014; Australian philosopher)