رسالة في بيان الحاصل بالمصدر - تاليف العلّامة محمّد امين بن محمود البخاريّ المكّيّ المعروف بـ امير باد شاه (ت حوالي 987هـ)

This letter written by Mohammed Ameen Bin Mahmood al-Hisseini al-Bikhari , who is known as Ameer Badshah. He died about 987 AH. The author dealt with the (reference) in Elm al-Osol. He narrated the opinions of a group of linguistics and discussed their opinions. He explained the meanings of some of the idioms in this aspect like , effects and affects. Later, he said that the meaning of reference is the effect without affects and what happens in the reference is the effects and also effects the object and other opinions. All what was mentioned made the letter a good example for who belongs to Elm al-Osol in their search in the linguistic aspects and they called it Mabahith al-Alfadh.