Saggs, H. W. F.
New American Library, 1968
Buku Teks
Thomas Y. Crowell, 1972
Buku Teks
Ferguson, Wallace K., author
Sir Isaac Pitman & Sons, [date of publication not identified]
Buku Teks
Whitmarsh, W. F. H.
Longmans, Green and Co., 1960
Buku Teks
Naidis, Mark, author
Dryden Press, 1972
Buku Teks