Friedrich Lenger. Economy and Society // The Shorter Oxford History of Germany: Germany, 1800–1870 / ed. Jonathan Sperber. New York, 2004. P. 92. См. также обсуждение: Theodore S. Hamerow. Restoration, Revolution, Reaction: Economics and Politics in Germany, 1815–1871. Princeton, NJ, 1958. Ch. 3.