Moore, W. G.
Penguin, 1974
Buku Referensi
Whittow, John B.
Allen Lane, 1984
Buku Referensi
Moore, W.G.
London : Penguin Books, 1984,
Buku Referensi
Mayhew, Susan
Oxford University Press, 1992
Buku Referensi
Goodall, Brian
Penguin Books, 1987
Buku Referensi