Harthan, John, author
Thame and Hudson, 1981
Buku Referensi
Naidis, Mark, author
Dryden Press, 1972
Buku Teks
Herz, John H.
Colombia University Press, 1960
Buku Teks
Kennan, George F., 1904-, author
Pantheon Books, 1983
Buku Teks
Grandsaignes d`Hauterive, Robert, 1881-, author
Larousse, 1947
Buku Referensi