Adams – Endless Punishment is a scriptural argument for the doctrine of Endless Punishment by Adams (Congregationalist). He outlines the teaching of Scripture making the point that this is what the Scripture really teaches.
This is Arendzen’s Catholic work on “eternal punishment” looking at the nature of eternal punishment, comments and teaching in Scripture, Tradition, and reason, and the final chapter is special questions.
This is a very large and somewhat complicated work by Alger (Universalist) on issues of the existence and destiny of the soul. Note that this work may contain arguments against the existence of hell. I would not recommend it for most Christians.