Clark, C. M. (2006). Iron kingdom: The rise and downfall of Prussia, 1600-1947. Belknap Press of Harvard University Press.
Čikaški stil citiranja (17. izdanje)Clark, Christopher M. Iron Kingdom: The Rise and Downfall of Prussia, 1600-1947. Cambridge, Mass.: Belknap Press of Harvard University Press, 2006.
MLA način citiranja (8. izdanje)Clark, Christopher M. Iron Kingdom: The Rise and Downfall of Prussia, 1600-1947. Belknap Press of Harvard University Press, 2006.
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