Henry, Nicholas
Prentice-Hall, 1975
Buku Teks
Henry, Nicholas
Prentice-Hall, 1992
Buku Teks
Simon, Herbert A., author
Alfred A. Knopf, 1973
Buku Teks
Pfiffner, John M., author
Ronald Press, 1960
Buku Teks
Bartholomew, Paul C., author
Littlefield, Adams, 1959
Buku Teks