Cassey, Edward S.
University of California Press, 1983
Buku Teks
Cassey, Edward S
The university of California press, 1997
Buku Teks
Cohen, Martin
Blackwell Publishing, 2008
Buku Teks
Stumpf, Samuel Enoch, 1918-1998
McGraw-Hill, 1989
Buku Teks
Windelband, Wilhelm
Dover, 1956
Buku Teks