Callahan, D. (1990). What kind of life: The limits of medical progress. Simon and Schuster.
Lua i Stíl Chicago (17ú heag.)Callahan, Daniel. What Kind of Life: The Limits of Medical Progress. Simon and Schuster, 1990.
Lua MLA (9ú heag.)Callahan, Daniel. What Kind of Life: The Limits of Medical Progress. Simon and Schuster, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.