Lombra, Raymond E.
McGraw-Hill, 1980
Buku Teks
Gurley, John G.
The Brookings Institution , 1960
Buku Teks
Auerbach, Robert D., author
Macmillan, 1989
Buku Teks
Miller, Roger LeRoy, author
McGrow-Hill, 1985
Buku Teks
Miller, Roger LeRoy, author
McGraw-Hill, 1993
Buku Teks