Williamson, James A., author
Macmilan and Co,, 1950
Buku Teks
Winkowski, Fred
Pavilion,, 1994
Buku Teks
Jaceb, E. F., author
Clarendon Press, 1961
Buku Teks
Commager, Henry Steele, author
Dodd, Mead, 1965
Buku Teks
Morton, A.L., author
Victor Gollancz, 1938
Buku Teks