Clark, Robert C., author
Little, Brown, 1986
Buku Teks
Vagts, Detlev F., author
The Foundation Press, INC, 1973
Buku Teks
edited by Claire A. Hill and Brett H. McDonnell
Edward Elgar Publishing, 2016
Buku Teks
M. Bender, 1995
Buku Teks
Barnes, A. James, author
Irwin , 1991
Buku Teks