selected and introduced by Roy Harris
Routledge/Thoemmes Press, 1995
Buku Referensi
Pope, Rev G.U., author
Clarendon Press, 1905
Buku Referensi
Martin, James, author
Prentice-Hall, 1986
Buku Teks
Encyclopaedia Britannica, 1981
Buku Referensi
Buku Teks