Não informado. (2001). Rubber Statistical Bulletin. International Rubber Study Group.
Lua i Stíl Chicago (17ú heag.)Não informado. Rubber Statistical Bulletin. London: International Rubber Study Group, 2001.
Lua MLA (8ú heag.)Não informado. Rubber Statistical Bulletin. International Rubber Study Group, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.