Otis, William Bradley
Barnes & Noble, 1939
Koleksi Publik
Needleman, Morris H.
Barnes & Noble, 1939
Koleksi Publik
Collier, WIlliam Francis
Thomas Nelson and Son, 1920
Buku Teks
Blamires, Harry
Longman, 1989
Buku Teks
Evans, B. Ifor
Penguin Books, 1944
Buku Teks