Não informado. (1987). AEI economist. American Enterprise Institute for Public Policy Research.
Chicago-referens (17:e uppl.)Não informado. AEI Economist. Washington: American Enterprise Institute for Public Policy Research, 1987.
MLA-referens (8:e uppl.)Não informado. AEI Economist. American Enterprise Institute for Public Policy Research, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.