Hansen, Don R.
South-Western College, 2000
Buku Teks
Dopson, Lea R.
John Wiley & Sons, 2008
Buku Teks
Hansen, Don R.
South-Western College Publishing, 1997
Buku Teks
Hansen, Don R.
South-Western College Publishing, 1997
Buku Teks
Usry, Milton F.
South Western, 1988
Buku Teks