Johnstone, H. W. (1959). Philosophy and argument. Pennsylvania State University Press.
Lua i Stíl Chicago (17ú heag.)Johnstone, Henry W. Philosophy and Argument. [University Park]: Pennsylvania State University Press, 1959.
Lua MLA (9ú heag.)Johnstone, Henry W. Philosophy and Argument. Pennsylvania State University Press, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.