The tax system established by Hazrat Umar (RA); (An Analytical Study of the Four Schools of Jurisprudence): حضرت عمررضی اللہ عنہ  کا مرتّب کردہ ٹیکسز کا نظام؛فقہی مذاہب اربعہ کاتجزیاتی مطالعہ. Rooh-e-Tahqeeq, [S. l.], v. 3, n. 4, p. 3–14, 2024. Disponível em: https://rooh-e-tahqeeq.com/index.php/ret/article/view/110. Acesso em: 14 jan. 2026.