Philosophical Alternatives by C. D. Broad - http://www.ditext.com/broad/cdbroad.html Primary and secondary bibliographies, and extensive online texts, compiled and introduced by Andrew Chrucky.
Papers of Charlie Dunbar Broad - http://rabbit.trin.cam.ac.uk/~jon/Broad/Broadframeset.html An online catalogue of the archive of this philosopher's papers, housed at the Trinity College Library in Cambridge University.
