Hume, David
J.M. Dent & Sons , 1959
Buku Teks
Von Mises, Ludwig, 1881-1973
Yale University Press, 1963
Buku Klasik
Krutch, Joseph Wood
Random House, 1959
Buku Teks
Krutch, Joseph Wood
Greenwood Press, 1979
Buku Teks
Baumeister, Roy F.
Thomson, 2008
Buku Teks