Carnap, R. (1956). Meaning and necessity. University of Chicago Press.
Lua i Stíl Chicago (17ú heag.)Carnap, Rudolf. Meaning and Necessity. Chicago: University of Chicago Press, 1956.
Lua MLA (9ú heag.)Carnap, Rudolf. Meaning and Necessity. University of Chicago Press, 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.