Cita APA (7a ed.)

Organisation for Economic Co-operation and Development. (2011). SIGMA public procurement briefs. OECD.

Cita Chicago Style (17a ed.)

Organisation for Economic Co-operation and Development. SIGMA Public Procurement Briefs. Paris: OECD, 2011.

Cita MLA (9a ed.)

Organisation for Economic Co-operation and Development. SIGMA Public Procurement Briefs. OECD, 2011.