For the Investiture Controversy, I have seen many people use the source
collection titled The Crisis of Church and State, edited by
Brian Tierney. It is available in paperback from the Medieval Academy
Reprints for Teaching and contains many significant primary documents with
helpful summaries, not only for the Investiture Controversy itself but for
other medieval situations in which church and state were in contest.
Belle Tuten
Emory University
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