1. Armstrong, D. M. (1978a). Nominalism and Realism (Vol. 1 of Universals and Scientific Realism), Cambridge: Cambridge University Press
2. Armstrong, D. M. (1978b). A Theory of Universals (Vol. 2 of Universals and Scientific Realism), Cambridge: Cambridge University Press
3. Armstrong, D. M. (1997). A World of States of Affairs. Cambridge: Cambridge University Press
4. Armstrong, D. M. (2004a). ‘Going through the Open Door Again: Counterfactual versus Singularist Theories of Causation’. in Collins et al. (eds.), Causation and Counterfactuals (pp. 445–457). London: The MIT Press
5. Armstrong, D. M. (2004b). Truth and Truthmakers. Cambridge: Cambridge University Press