edited by John Miksic
Archipelago Press, [Date of publication not identified]
Buku Teks SO
Bone, Robert G.
Littlefield, Adam, 1957
Buku Teks SO
edited by Geoffrey Parker
Cambridge University Press, 1995
Buku Referensi
Rickard, J.A.
Barnes & Noble, 1952
Buku Teks SO
Windelband, Wilhelm
Dover, 1956
Buku Teks SO