by edited by David F. Heathfield
Macmillan, 1976
Buku Teks
Allen, R.G.D.
Macmillan, 1973
Buku Teks
Colander, David C.
McGraw-Hill , 2001
Buku Teks
DeLong, J. Bradford
McGraw-Hill, 2002
Buku Teks
Parkin, Michael, 1939-
Prentice-Hall, c1992
Buku Referensi