Ingo-Eric M.
London : k.C. Saur Munchen, 1981,
Buku Referensi
Turville-Petre, Thorlac, author
Blackwell Publishing, 2007
Buku Teks
Otis, William Bradley, author
Barnes & Noble, 1939
Koleksi Publik
Needleman, Morris H., author
Barnes & Noble, 1939
Koleksi Publik
Collier, WIlliam Francis, author
Thomas Nelson and Son, 1920
Buku Teks