Rowland Ward, author of God and Adam and co-author of Scripture and Worship, has a number of useful articles on his church website. Below you will find a series of articles on Covenant Theology.
Law and Righteousness in Scripture and Confession
Review: The Presbyterian Doctrine of Children in the Covenant
Covenant and Justification #1
Covenant and Justification #2
Covenant and Justification #3
Creation and Covenant
God’s Covenant Unfolded: Creation to New Creation
Here is a list of the categories in which the rest of the articles can be found.
I appeal to you, brothers, to watch out for those who cause divisions and create obstacles contrary to the doctrine that you have been taught; avoid them. For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naïve. (Romans 16:17-18)