Munchen/Zurich : Droemer Knaur, 1979
Buku Teks
Bamberger, David
New Jersey: Behrman House, 1979
Buku Teks
Burckhardt, C.J.
Frankfurt: Fischer Bucherey, 1956
Buku Teks
Wiesbaden : Fuchs Consult
Majalah, Jurnal, Buletin
Leiden : E.J. Brill
Majalah, Jurnal, Buletin