Richardson, J. D. (1993). Sizing up U. S. export disincentives. Institute for International Economics.
Lua i Stíl Chicago (17ú heag.)Richardson, J. David. Sizing Up U. S. Export Disincentives. Washington, D. C: Institute for International Economics, 1993.
Lua MLA (9ú heag.)Richardson, J. David. Sizing Up U. S. Export Disincentives. Institute for International Economics, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.