Gregory, R. L.
McGraw-Hill, 1973
Buku Teks
Maritain, Jacques
Pantheon Books , 1955
Buku Teks
Serenella Ciclitira, editor
Skira editore, 2011
Buku Teks
edited by Deborah Cherry
Blackwell, 2005
Buku Teks
editor, Hilda Soemantri
Archipelago Press, 1998
Buku Referensi