edited by Langdon Lynne Faust
Ungar, 1988
Buku Referensi
Seward, William W., author
Frederick Fell, 1963
Buku Teks
Keyssar, Helene
Macmillan Press , 1972
Buku Teks
Williams, Ethel L.
Scholarly Resources Press, 1977
Buku Referensi
Robinson, Alan, author
Macmillan, 1988
Buku Teks