The study of everything we believe about God.

The Existence and Attributes of God by Stephen Charnock
The Attributes of God by Milburn Cockrell
Lectures in Biblical Theology of the New Testament by C.D. Cole
Definitions of Doctrine, 3 volumes by C.D. Cole
Brief Studies in Christian Doctrines by J.E. Cobb
A Body of Doctrinal and Practical Divinity by John Gill
The Cause of God and Truth by John Gill
The Little Book of BIG Bible Doctrines by Jessica Madison
Sovereignty of God by A.W. Pink
The Attributes of God by A.W. Pink
Abandoned Truth: The Doctrines of Grace by Tom Ross
A Systematic Study of Bible Doctrine  by T.P. Simmons
A Body of Divinity by Thomas Watson