Yazar : M. H. Najafi

Fiqh Ja'ffariyya men 'Ushr ki Haqîqat wa-Haithiyat (Ushr in the Ja'farî Jurísprudence)

Ushr is payable only on four crops, i.e.i wheat, barley, dates and grapes. 'Ushr is payable on 'ushri lands only. On kharãji lands only kharãj is payable. For general readers. . Based on primary sources. Documented.