Here are links to some primary sources for the research paper topics:
 

1.  First Crusade in Jerusalem, 1099:

       Gesta francorum ("The Deeds of the Franks"), The siege of Jerusalem, 1099

       Fulk of Chartres, The capture of Jerusalem, 1099

       The siege and capture of Jerusalem, 1099: Collected accounts

      Two Muslim accounts of the conquest of Jerusalem by the Franks, AH 492 [AD 1099] 


2.  England in 1215:

     John's concession of England to Pope Innocent III, 1213

     Roger of Wendover: The battle of Bouvines, 1214

     William the Breton (chaplain to Philip Augustus): The battle of Bouvines, 1214   

     Roger of Wendover: Runnymede, 1215

     Magna Carta

     Photographs of Rochester Castle (besieged by John in 1215)  [Only the photographs of the castle itself, not the text of this
        web site, represent a primary sources]
 

3.  Inquisition in S. France, 1300-1320:

     Translations from the Inquisition Register of  Jacques Fournier  (Be sure to read Prof. Nancy P. Stork's
        notes on Bishop Fournier himself)

     Bernard Gui: On the Albigensians

     Bernard Gui: Inquisitorial technique
 
     Collection of sources on heresy and inquisition in S. France in the early fourteenth century


4.  Black Death in Paris:

     Six accounts of the pestilence in France (including Paris), Italy, and England

     Report of the medical faculty of the University of Paris, 1348