Dictionary of the Bible by 
The Anchor Bible Dictionary by 
Eerdmans Dictionary of the Bible by 
New Dictionary of Biblical Theology by
This is the standard dictionary for doing research in biblical theology.
Encyclopedia of Christian Theology by 
Global Dictionary of Theology by 
New Dictionary of Theology by 
Evangelical Dictionary of Theology by 
The Thiselton Companion to Christian Theology by 
The Oxford Companion to Christian Thought by 
The Oxford Dictionary of the Christian Church by 
Encyclopedia of Ancient Christianity by 
The Concise Dictionary of Early Christianity by 
The Concise Oxford Dictionary of the Christian Church by 
The Concise Dictionary of Christian Tradition by 
