Alertz, U. (2010). The Horologium of Harun al-Rashid Presented to Charlemagne - an Attempt to Identify and Reconstruct the Clock Using the Instructions Given by al-Jazari. Variantology 4 : On Deep Time Relations of Arts, Sciences and Technologies In the Arabic-Islamic World and Beyond.
Chicago-Zitierstil (17. Ausg.)Alertz, Ulrich. "The Horologium of Harun Al-Rashid Presented to Charlemagne - an Attempt to Identify and Reconstruct the Clock Using the Instructions Given by Al-Jazari." Variantology 4 : On Deep Time Relations of Arts, Sciences and Technologies In the Arabic-Islamic World and Beyond 2010.
MLA-Zitierstil (8. Ausg.)Alertz, Ulrich. "The Horologium of Harun Al-Rashid Presented to Charlemagne - an Attempt to Identify and Reconstruct the Clock Using the Instructions Given by Al-Jazari." Variantology 4 : On Deep Time Relations of Arts, Sciences and Technologies In the Arabic-Islamic World and Beyond, 2010.