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Lua i Stíl Chicago (17ú heag.)Raadschelders, J. C. N., Th. A. J. Toonen, agus F. M. van der Meer. The Civil Service in the 21st Century: Comparative Perspectives. Basingstoke ; New York: Palgrave Macmillan, 2007.
Lua MLA (8ú heag.)Raadschelders, J. C. N., et al. The Civil Service in the 21st Century: Comparative Perspectives. Palgrave Macmillan, 2007.
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