Encyclopedia of Islam and the Muslim World Siddiqi, Mohammad Nejatullah 1 January 2004
"Riba and Interest in Islamic Banking: an Historical Review"

ماهو الربا؟ وماحكمة في التعاليم الدينية والاسلام

The Oxford Dictionary of Islam.

5
تعريف الربا وبيان أنواعه
Those who equate riba with interest seek support from al-Jassas, who claimed that pre-Islamic Arabia practiced a form of riba where money was lent at a predetermined sum over the principal amount
أنواع الربا
Muslims have always agreed that Riba is prohibited
تعريف الربا وبيان أنواعه
981] no date , Ahkam al-Quran, V
However, there is no historical evidence to suggest that riba al-jahiliya also consisted of transactions that were similar to modern loans on interest "Riba and Interest in Islamic Banking: an Historical Review"
What constitutes Riba, has, however, been a subject evoking deliberation and debate over the centuries that followed divine revelation

الراجح في علة الربا في الأصناف الستة

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ما هو الربا ؟
لماذا حرم الله الربا ؟
ربا