Reddit mentions of The Eternal Generation of the Son: Maintaining Orthodoxy in Trinitarian Theology

Check out the blog of Ben Myers, a theology professor at United Theological College. He has some cool posts on the Trinity.

You have probably exposed yourself to many primary patristic sources on the Trinity, so here are some secondary sources.

• The Cambridge Companion to the Trinity: The Cambridge Companions series is excellent. This volume represents a rich collection of essays (and bibliographies for further study).
  
  
• Nicaea and Its Legacy: An Approach to Fourth-Century Trinitarian Theology by Lewis Ayres
  
  
• The Eternal Generation of the Son: Maintaining Orthodoxy in Trinitarian Theology by Kevin Miles
  
  May help round out non-Western understandings:
  
  
• The Trinity in Asian Perspective
  
  
• The Trinity: Global Perspectives