Forty, Adrian, author
Cameron Books, 2010
Buku Teks
Branca, Patricia, author
Croom Helm, 1978
Buku Teks
Habakkuk, H.J.
Leicester University Press, 1972
Buku Teks
Marwick, Arthur
Penguin Books, 1987
Buku Teks
Stearns, Peter N., author
Macmillan, 1967
Buku Teks