2国际货币基金组织秘书处.World Economic Outlook_Crisis and Recovery[EB/OL].Washington,D.C.:IMF,2009[2009-07-05].http://www.imf.org/external/pubs/ftlweo/2009/01/pdf/text.pdf.
3联合国贸发会秘书处.Review of Maritime Transport 2008[EB/OL], Geneva: UNCT AD, 2008 [2009-07-06]. http://www.unctad.org/en/does/rmt2008_en.pdf.