Blumner, Sidney M., author
Kendall Hunt, 1971
Buku Teks
Sanderson, Allen R., author
McGraw-Hill, 1981
Buku Teks
McKenna, John R.
Harper and Row , 1971
Buku Teks
edited by Kurt W. Rothschild
Penguin Books, 1971
Buku Teks
American Economic Association
George Allen and Unwin, 1959
Buku Teks