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Longhi, Simonetta, Nandi, Alita. (2015). A practical guide to using panel data . London: SAGE Publications.

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Longhi, Simonetta, Nandi, Alita. A practical guide to using panel data. London: SAGE Publications, 2015. Text.

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Longhi, Simonetta, Nandi, Alita. A practical guide to using panel data. London: SAGE Publications, 2015. Text.

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Longhi, Simonetta, Nandi, Alita. A practical guide to using panel data. London: SAGE Publications, 2015. Print.