Blackwell Companions to Philosophy, 1990
Buku Teks
edited by Nicholas Bunnin and E. P. Tsui-James
Wiley, 2003
Buku Teks
cambridge, 2006
Buku Teks
Harvard University Press, 1947
Buku Teks
Stumpf, Samuel Enoch, 1918-1998, author
McGraw-Hill, 1971
Buku Teks