Kastantin, Joseph T., author
Quorum Books, 1988
Buku Teks
Seckler-Hudson, Catheryn, author
Washington, D.C., The American University Press
Buku Teks
Brigham, Eugene F., 1930-, author
The Dryden Press, 1994
Buku Teks
Brigham, Eugene F., 1930-, author
The Dryden Press, 1991
Buku Teks
Brigham, Eugene F., 1930-, author
The Dryden Press, 1977
Buku Teks