Cohen, Martin
Blackwell Publishing, 2008
Buku Teks
Stumpf, Samuel Enoch, 1918-1998
McGraw-Hill, 1999
Buku Teks
Stumpf, Samuel Enoch, 1918-1998
McGraw-Hill, 1989
Buku Teks
Windelband, Wilhelm
Dover, 1956
Buku Teks
Kenny, Anthony
Blackwell Publishing, 2007
Buku Teks