Sylvia, Ronald D., author
Harcourt College Publisher, 2002
Buku Teks
Sylvia, Ronald D.
Harcourt College Publisher, 2002
Buku Teks
Cayer, N. Joseph, author
Thomson wadsworth, 2004
Buku Teks
Simon, Herbert A., author
Alfred A. Knopf, 1973
Buku Teks
Bartholomew, Paul C., author
Littlefield, Adams, 1959
Buku Teks