المؤلفون: Hunckel, G., Heyse, J. G.
الوصول الحر: https://www.europeana.eu/item/09428/suub_hist_index_jsp_id_V_2_a_235_943?utm_source=api&utm_medium=api&utm_campaign=YuvuWBeCaTest
الوصول الحر: http://europeana.eu/portal/record/09428/suub_hist_index_jsp_id_V_2_a_235_943.htmlTest