Não informado. (2009). Main Science and Technology Indicators. Organization for Economic Co-operation and Development.
Lua i Stíl Chicago (17ú heag.)Não informado. Main Science and Technology Indicators. Paris: Organization for Economic Co-operation and Development, 2009.
Lua MLA (8ú heag.)Não informado. Main Science and Technology Indicators. Organization for Economic Co-operation and Development, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.