Presthus, Robert, author
Vintage Books, 1962
Buku Teks
Phillips, Robert, 1968-, author
Berrett-Koehler, 2003
Buku Teks
Lindner, C.C., author
CRC Pres, 2009
Buku Teks
Slusky, Ludwig
Times Mirror, 1988
Buku Teks
Kahn, Robert L., 1918-, author
John Wiley & Sons, 1957
Buku Teks