Morley, Samuel A.
The Dryden Press, 1984
Buku Teks
Samuelson, Paul Anthony, 1915-2009
New York, 2005
Buku Teks
Lindauer, John
John Wiley & Sons, 1971
Buku Teks SO
Taylor, John B., 1946-
Wadsworth and Cengage Learning, 2012
Buku Teks
DeLong, J. Bradford
McGraw-Hill, 2002
Buku Teks SO