My history Proffessor has been giving me back my proposal for the past two weeks

My history Proffessor has been giving me back my proposal for the past two weeks

My history Proffessor has been giving me back my proposal for the past two weeks and the class is in Chaos because of his lack of instructions. So far my Research Proposal question is “What were the justifications for Pope Gregory and Henry IV for the invesiture crisis”. I just need a rough explination for 6 secondary scholarly sources, and a few sources that include 15 referenced pages from primary sources, probably the letters from Pope Gregory and Henry IV.