Ellis, Joseph J., author
Alfred Knopf, 2003
Buku Teks
Moscow, Henry
American Heritage Publishing Co, 1960
Buku Teks
Loon, Henrik Willem van
Dodd Nead, 1962
Buku Teks
Doubleday & Company, INC, 1966
Buku Teks
Rice, Howard C., author
Princeton University Press, 1976
Buku Referensi