Gibbon, Edward
Random House , 1993
Buku Referensi
Finkel, Caroline, author
A member of the perseus Books Group, 2005
Buku Teks
Robinson, Chase F., author
Cambridge, 2003
Buku Teks
Brinton, Crane, 1898-1968, author
Prentice-Hall, 1960
Buku Teks
Lawrence, John
Farrar Straus & Cudahy, 1959
Buku Teks