Katen, T. E. (1973). Doing philosophy. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Katen, Thomas Ellis. Doing Philosophy. Englewood Cliffs, N. J: Prentice-Hall, 1973.
Lua MLA (9ú heag.)Katen, Thomas Ellis. Doing Philosophy. Prentice-Hall, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.