Clark, John M., author
National Bureau of Economic Resesarch, 1934
Buku Teks
Fels, Rendings
The University of North Carolina Press, 1959
Buku Teks
Matthews, R.C.O., author
University of Chicago Press, 1959
Buku Teks
edited by Michael T. Belongia and Michelle R. Garfinkel
Kluwer, 1992
Buku Teks
selected by a committee of the American Economic Association
Blakiston, 1951
Buku Teks