Weiner, J. (1999). Frege. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Weiner, Joan. Frege. Oxford: Oxford University Press, 1999.
Lua MLA (9ú heag.)Weiner, Joan. Frege. Oxford University Press, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.