Organisation for Economic Co-operation and Development, Statistical Office of the European Communities, & ProQuest (Firm). (2008). Detailed tables by service category, 1997-2006: Tableaux detailles par categories de services, 1997-2006. OECD.
Cita Chicago (17th ed.)Organisation for Economic Co-operation and Development, Statistical Office of the European Communities, i ProQuest (Firm). Detailed Tables by Service Category, 1997-2006: Tableaux Detailles Par Categories De Services, 1997-2006. Paris: OECD, 2008.
Cita MLA (9th ed.)Organisation for Economic Co-operation and Development, et al. Detailed Tables by Service Category, 1997-2006: Tableaux Detailles Par Categories De Services, 1997-2006. OECD, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.