Não informado. (1950). Yearbook of International Trade Statistics. United Nations.
Lua i Stíl Chicago (17ú heag.)Não informado. Yearbook of International Trade Statistics. New York: United Nations, 1950.
Lua MLA (8ú heag.)Não informado. Yearbook of International Trade Statistics. United Nations, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.