Schiavo-Campo, Salvatore
Winthrop Publishers, Inc., 1978
Buku Teks
Chacholiades, Miltiades, author
McGraw-Hill, 1981
Buku Teks
Gilpin, Robert, author
Princeton University Press, 1987
Buku Teks
Lindert, Peter H., author
Irwin , 1996
Buku Teks
Williamson, John
Harvester Wheatsheaf, 1991
Buku Teks