Smith, Charles John, author
Bell and Sons, 1917
Buku Referensi
edited by Susan M. Lloyd
Penguin Books, [date of publication not identified]
Buku Referensi
Otis, William Bradley, author
Barnes & Noble, 1939
Koleksi Publik
Needleman, Morris H., author
Barnes & Noble, 1939
Koleksi Publik
Green, J. R.
London Dent 1915
Buku Teks