Economic Aspects in the Book of Al-bilad (the Countries) by Al-Yaqubi (d. 292 A.H.). ISJ [انترنت]. 17 مارس، 2023 [وثق 7 أكتوبر، 2026];13(7):67-88. موجود في: http://jis.tu.edu.iq/index.php/jis/article/view/363