Berlin 1899 : the Seventh International Geographical Congress : a retrospect on occasion of the 32th IGC, Cologne, August 2012 / Jörg Stadelbauer. - Freiburg i. Br., 2012. Tł.

DNB online

American Studies Journal, 06.08.13 http://www.theasa.net/journals/name/copas_current_objectives_of_postgraduate_american_studies/331/