Cox details the evidence for the doctrine of the Trinity in the Bible looking dozens of different angles.
This is a 17 page examination and defense of the doctrine of the Trinity. Alford examines Christ’s humanity as well as his divinity. Specifically Alford establishes Christ’s divine traits (omniscience, wisdom, omnipresence, immutability, omnipotence, equality with the Father, deity), and then he examines issues of the trinity, plurality of the Godhead, number of persons in the Godhead, the Father-Son-Spirit are one God. Then Alford examines the consequences of this doctrine, specifically in the light of the Unitarian’s denial of it, and finally Alford examines criticisms of the Trinity.
Robert Shaw’s short 1 chapter work on God and the Holy Trinity is an excellent collection of observations and verses that defend the Trinity.
Warfield Biblical Doctrine of the Trinity is a short single chapter work (29 pgs) on different biblical aspects of the Trinity.
Dabney was a Baptist, and this work is his Systematic Theology. Dabney was also Calvinistic.
The Bible itself reveals those doctrines that are essential to the Christian faith. They are 1) the Deity of Christ, 2) Salvation by Grace, 3) Resurrection of Christ, 4) the gospel, and 5) monotheism. These are the doctrines the Bible says are necessary.
This small article could very well determine whether you are in or out of the Christian Faith
Litmus Test: You have to believe items 1-5 to be in the Christian Faith.
Hislop Two Babylons is an extensive work on Roman Catholicism, showing their doctrines and practices.