Corden, W. (1971). The theory of protection. Oxford Uni. press.
Lua i Stíl Chicago (17ú heag.)Corden, W. The Theory of Protection. London: Oxford Uni. press, 1971.
Lua MLA (9ú heag.)Corden, W. The Theory of Protection. Oxford Uni. press, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.