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Dittmar, Jeremiah (2013) New media, firms, ideas, and growth: European cities after Gutenberg. National Bureau of Economic Research, Cambridge, USA.
Dittmar, Jeremiah E. (2011) Information technology and economic change: the impact of the printing press. The Quarterly Journal of Economics, 126 (3). pp. 1133-1172. ISSN 0033-5533
Gardner, Leigh (2008) To take or to make?: contracting for legitimacy in the emerging states of twelth century Britain. Discussion papers in economic and social history, 73. University of Oxford, Oxford, UK.
Michaels, Guy and Rauch, Ferdinand (2013) Resetting the urban network: 117-2012. BREAD working papers, 405. Bureau for Research and Economic Analysis of Development (BREAD), Durham, USA.