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来源: britannica.com, britannica.com, worldhistory.org, worldhistory.org, worldhistory.org, worldhistory.org, britannica.com, britannica.com, britannica.com, britannica.com, history.com, christianhistoryinstitute.org, christianhistoryinstitute.org, christianhistoryinstitute.org, christianhistoryinstitute.org, lutheranreformation.org, lutheranreformation.org, ghdi.ghi-dc.org, guides.loc.gov, library.tc.columbia.edu, ebsco.com, ebsco.com, billpetro.com, historyskills.com, newworldencyclopedia.org, germanhistorydocs.org, christian-history.org, ministrymagazine.org