Gustafson, D. F. (1964). Essays in philosophical psychology. Macmillan.
Lua i Stíl Chicago (17ú heag.)Gustafson, Donald F. Essays in Philosophical Psychology. London: Macmillan, 1964.
Lua MLA (9ú heag.)Gustafson, Donald F. Essays in Philosophical Psychology. Macmillan, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.