Nordin, J.A.
Prentice-Hall, 1954
Buku Teks
Fairchild, Fred Rogers
Macmillan, 1989
Buku Teks
McConnell, Campbell R.
McGraw-Hill, 1966
Buku Teks
Lipsey, Richard G.
Harper Collin, 1996
Buku Teks
Adreson, W. H. Locke
Prentice Hall of India, 1986
Buku Teks