What is a good list of sources on the Holy Spirit in the early church after the book of the Acts of the Apostles? I am looking for the different manifestations of the Spirit like the dove when Jesus was baptized. I have read Gregory of Nazianzus's Five Theological Orations, Augustine of Hippo's On the Trinity, Cyril of Alexandria's On the Unity of Christ, Early Christian Doctrines by Kelly, and The Spirit of God Short Writings on the Holy Spirit by Yves Congar. From my reading it seems that throughout the first three centuries of Christianity, no theologian held to the doctrine that the one God is tripersonal and consists of the Father, the Son, and the Holy Spirit as equally divine persons.