Kuznets, Simon Smith, 1901-
Shares of upper income groups in income and savings
National Bureau of Economic Reserach, 1950
 Buku Teks
Duesenberry, James S. (James Stemble), 1918-2009
Income, saving and the theory of consumer behavior
Harvard University Press, 1959
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Achieving universal coverage of health care: experiences from middle and upper income countries
editors, Sanguan Nitayarumphong, Anne Mills
NHSO, 2005
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Morgan, Theodore
Income and employment
Prentice-Hall, 1956
 Buku Teks
Morgan, Theodore
Income and employment
Prentice-Hall, 1948
 Buku Teks