UNITED NATION. (2002). GLOBAL ENVIRONMENT OUTLOOK 3-CD. EARTHSCAN.
Cita Chicago (17th ed.)UNITED NATION. GLOBAL ENVIRONMENT OUTLOOK 3-CD. LONDON: EARTHSCAN, 2002.
Cita MLA (9th ed.)UNITED NATION. GLOBAL ENVIRONMENT OUTLOOK 3-CD. EARTHSCAN, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.