Rev Dr Paul M. Collins 
The Trinity: A Guide for the Perplexed [PDF ebook] 

Although the doctrine of the Trinity is a core Christian belief, it remains contested in terms of how it is conceptualized and expressed. This essential guide expounds different conceptual models and the technical language used to express these models. Providing a complete overview, as well as new insights into the area,
The Trinity: A Guide for the Perplexed is an essential read for students of Christian Theology.