Laiden : Brill Academic Publishers
Majalah, Jurnal, Buletin
Zeitlin, Irving M.
Gadjah Mada University Press, 1995
Buku Teks
Berghe,Pirre Van Den
Basic Books Inc Publishers, 1970
Buku Teks
Little, Brown and Company, 1986
Buku Teks
Schrag, Clarence C.
Harper & Row, 1963
Buku Teks