Não informado. (2009). Main Science and Technology Indicators. Organization for Economic Co-operation and Development.
Citação do estilo Chicago (17ª ed.)Não informado. Main Science and Technology Indicators. Paris: Organization for Economic Co-operation and Development, 2009.
Citação MLA (8ª ed.)Não informado. Main Science and Technology Indicators. Organization for Economic Co-operation and Development, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.