Bade, Robin, author
Pearson, 2013
Buku Teks
Townsend, Harry, author
Routledge , 1995
Buku Teks
Lipsey, Richard G., 1928-, author
Harper Collin, 1996
Buku Teks
Adreson, W. H. Locke, author
Prentice Hall of India, 1986
Buku Teks
Samuelson, Paul A. (Paul Anthony), 1915-2009, author
McGraw-Hill, 1992
Buku Teks