Zeller, Eduard, 1814-1908, author
Meridian Books, 1960
Buku Teks
Hazel, John, author
Routledge, 2000
Buku Teks
Rose, H.J.
Hutchinson's University Library , [date of publication not identified]
Buku Teks
Tomlinson, R.A., author
British Museum Press, 1995
Buku Teks
Hazel, John, author
Routledge, 2000
Buku Referensi