Benavie, Arthur
Prentice-Hall, 1972
Buku Teks
edited by Karl Shell
MIT Press, 1967
Buku Teks
Kuznets, Simon Smith, 1901-
W.W. Norton&Company-Inc, 1965
Buku Teks
edited by David Cass, Karl Shell
Academic Press, 1976
Buku Teks
Nourse, Hugh O.
McGraw-Hill, 1968
Buku Teks