Não informado. (1987). UNCTAD commodity yearbook. United Nations.
Lua i Stíl Chicago (17ú heag.)Não informado. UNCTAD Commodity Yearbook. New York: United Nations, 1987.
Lua MLA (8ú heag.)Não informado. UNCTAD Commodity Yearbook. United Nations, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.