Hölzl, R. (2006). Nature Conservation in the Age of Classical Modernity: The Landesausschuss für Naturpflege and the Bund für Naturschutz in Bavaria, 1905-1933. Bulletin of the German Historical Institute Washington, DC.
Čikaški stil citiranja (17. izdanje)Hölzl, Richard. "Nature Conservation in the Age of Classical Modernity: The Landesausschuss Für Naturpflege and the Bund Für Naturschutz in Bavaria, 1905-1933." Bulletin of the German Historical Institute Washington, DC 2006.
MLA način citiranja (8. izdanje)Hölzl, Richard. "Nature Conservation in the Age of Classical Modernity: The Landesausschuss Für Naturpflege and the Bund Für Naturschutz in Bavaria, 1905-1933." Bulletin of the German Historical Institute Washington, DC, 2006.
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