Plenum Press , 1990
Buku Teks
Lowe, Donald M.
Duke University Press , 1995.
Buku Teks
Kennedy, Eugene
Free Press , 1997
Buku Teks
David, Kingley, author
Rinehart, 1951
Buku Teks
edited, John B. Williamson, Linda Evans and Michael Rustad
Little, Brown, 1985
Buku Teks