Muller, Roger LeRoy
Addison-Wesley, 2000
Buku Teks
Keat, Paul G
Pearson Education International, 2003
Buku Teks
Lipsey, Richard G.
Harper Collin, 1996
Buku Teks
Adreson, W. H. Locke
Prentice Hall of India, 1986
Buku Teks
Samuelson, Paul Anthony, 1915-2009
McGraw-Hill, 1992
Buku Teks