McCloskey, Robert G., author
Harvard University Press, 1973
Buku Teks
McCloskey, Robert G., author
The University of Chicago Press, 1962
Buku Teks
Newkirk, John A.
Addison-Wesley, 1983
Buku Teks
Maddux, John L.
World Bank, 1981
Buku Teks
Longman Cheshire, 1984
Buku Teks