Bulajic, Milan
Martinus Nijhoff, 1993
Buku Teks
Weiss, John
Prentice-Hall, 1995
Buku Teks
Staley, Eugene
Harper & Brother , 1954
Buku Teks
Poulsen, Lauge N. Skovgaard
Cambridge University Press, 2015
Buku Teks
Rothstein, Robert L.
Columbia University Press, 1977
Buku Teks