edited by Max F. Millikan
Yale University Press, 1953
Buku Teks
Brownlee, O.H. (Oswald Harvey), 1917-, author
Prentice-Hall, 1954
Buku Teks
Tolles, N. Arnold
Prentice-Hall, 1964
Buku Teks
Clark, John M., author
National Bureau of Economic Resesarch, 1934
Buku Teks
Albrecht, Karl, 1941-, author
Dow Jones-Irwin , 1985
Buku Teks