Não informado. (2009). Main Science and Technology Indicators. Organization for Economic Co-operation and Development.
Chicago-Zitierstil (17. Ausg.)Não informado. Main Science and Technology Indicators. Paris: Organization for Economic Co-operation and Development, 2009.
MLA-Zitierstil (8. Ausg.)Não informado. Main Science and Technology Indicators. Organization for Economic Co-operation and Development, 2009.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.