Feiwel, George R.
Praeger Pub., 1972
Buku Teks
Couper, James R.
Van Nostrand Reinhold , 1986
Buku Teks
Rachwald, Arthur R.
Westview Press, 1983
Buku Teks
Peters, Robert Henry
Cambridge University Press, 1983
Buku Teks
Ashburn, Peter
John Wiley & Sons, 1992
Buku Teks