Utton, M. A., & Morgan, A. D. (1983). Concentration and foreign trade. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Utton, M. A., agus Ann D. Morgan. Concentration and Foreign Trade. Cambridge: Cambridge University Press, 1983.
Lua MLA (9ú heag.)Utton, M. A., agus Ann D. Morgan. Concentration and Foreign Trade. Cambridge University Press, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.