Ehring, D. (1997). Causation and persistence: A theory of causation. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Ehring, Douglas. Causation and Persistence: A Theory of Causation. New York ; Oxford, [England]: Oxford University Press, 1997.
Lua MLA (9ú heag.)Ehring, Douglas. Causation and Persistence: A Theory of Causation. Oxford University Press, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.