Thomas, Robert Murray, 1921-
Corwin Press, 2008
Buku Teks
Garson, G. David
Marcel Dekker, 2002
Buku Referensi
Madsen, David, 1929-
Jossey-Bass, 1992
Buku Teks
O`Neil, L. Peat
Writer's Digest Books, 1995
Buku Teks
Lester, James D. Sr., 1935-2006
Pearson, 2015
Buku Teks