Haase, C. (2010). Modest Variations - Theoretical Tradition and Practical Innovation in the Mechanical Arts from Antiquity to the Arab Middle Ages. Variantology 4 : On Deep Time Relations of Arts, Sciences and Technologies In the Arabic-Islamic World and Beyond.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Haase, Claus-Peter. "Modest Variations - Theoretical Tradition and Practical Innovation in the Mechanical Arts from Antiquity to the Arab Middle Ages." Variantology 4 : On Deep Time Relations of Arts, Sciences and Technologies In the Arabic-Islamic World and Beyond 2010.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Haase, Claus-Peter. "Modest Variations - Theoretical Tradition and Practical Innovation in the Mechanical Arts from Antiquity to the Arab Middle Ages." Variantology 4 : On Deep Time Relations of Arts, Sciences and Technologies In the Arabic-Islamic World and Beyond, 2010.