Otto, Henry J.
Aplenton-Century-Crofts, 1964
Buku Teks
Martinus Nijhoff, 1968
Buku Teks
Sage Publications, 1977
Buku Teks
Burton, Steven J., editor
Canbridge University Press, 1992
Buku Teks
Burton, Steven J., editor
West Publishing Co., 1995
Buku Teks