Nygh, PE.
Butterworth, 1984
Buku Teks
Levontin, Avigdor Victor, 1922-, author
A.W. Sijthoff, 1976
Buku Teks
under the general editorship of J.H.C. Morris, with specialist editors
Stevens: Sweet & Maxwell, 1949
Buku Teks
Ehrenzweig, Albert A., author
West Publishing, 1962
Buku Teks
Nadelmann, Kurt H., author
Martinus Nijhoff, 1972
Buku Teks