Constable, George
Time-life Int. (Nederland)B.V., 1974
Buku Teks
Brace, C. Loring, author
Prentice-Hall, 1979
Buku Teks
Howells, William D., author
Doubleday, 1967
Buku Teks
edited by Jacquetta Hawkes
McGraw-Hill, 1974
Buku Referensi
Clark, J. Desmond
Penguin Books Inc., 1959
Buku Teks