I didn’t have the heart to post this in reply to Who is the Pre-eminent authority on dispensational pre-millenialism, and do they have a book in Logos? 
But a Reformed gentleman who understood dispensationalism and critiqued it very effectively was John H. Gerstner. I would like to see if is book Wrongly Dividing the Word of Truth: A Critique of Dispensationalism can be made available in Logos format.
Also:
Understanding Dispensationalists by Vern Sheridan Poythress.
Dispensationalism: Rightly Dividing the People of God? by Keith A. Mathison
The last two are both from P & R, from which we have been promised more titles. 