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- Online
- Oxford Dictionary of the Christian Church [Ref BR95 .O8]
- Oxford Encyclopedia of the Reformation [Ref BR302.8 .O93 ]
- Encyclopedia of Religion in America [Ref. B2520 E52]
- New Catholic Encyclopedia, 1st and 2nd eds, 1967 and 2003 [Ref BX841 .N44; online]
- Gale Virtual Reference Library (e.g. New Dictionary of the History of Ideas)
- Credo Reference
- Oxford Reference Online
- Print: finding them
- First stop: Reference Universe
- New Westminster Dictionary of Church History, 2008- [Ref BR95 .W496]
- Encyclopedia of the Early Church, 1992 [Ref. BR66.5 .D5813 ]
- Patrology, by Johannes Quasten, 1984-2006 [Ref. BR67 .Q3 ]
- Dictionary of the Middle Ages, 1982-1989 [Ref. D114 .O94 ]
- Women and Gender in Medieval Europe, 2006 [Ref. HQ1147 .E85 W66]
- Encyclopedia of Protestantism, 2004 [Ref BX4811.3 .E53 ]
- Encyclopedia of American Religious History, 3rd ed., 2009 [Ref BL2525 .Q44]
- Encyclopedia of the American Religious Experience, 1988 [Ref. BL2525 .E53]
- New Dictionary of the History of Ideas, 2005 [Ref CB9 .N49]
- and see:CHST503
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