Johnson, Harry G., author
Praeger , 1968
Buku Teks
Bulajic, Milan, author
Martinus Nijhoff, 1993
Buku Teks
Weiss, John, author
Prentice-Hall, 1995
Buku Teks
Staley, Eugene, author
Harper & Brother , 1954
Buku Teks
Poulsen, Lauge N. Skovgaard, author
Cambridge University Press, 2015
Buku Teks