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Successful surveys research methods and practice ανά Guppy, Neil

Economic freedom of the world, 2008 annual report ανά Gwartney, James D., Lawson, Robert, Hall, Joshua Hall, Norton, Seth

Social research methodology a critical introduction ανά Gomm, Roger

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2007 survey of Japanese-affiliated firms in ASEAN and India.

Trip generation an ITE informational report.

Economic freedom of the world, 2008 annual report

International handbook of survey methodology

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Pakistan demographic and health survey, 2006-07.