http://amzn.com/1433684020
I've been fortunate to have Wellum for 4 courses at Southern Seminary, including one where we worked through his work (with Peter Gentry), "Kingdom through Covenant." This book is a collection of 10 essays which build on that book's thesis to examine theological questions (Sabbath, ethics, Rom 9-11, etc.).
Be great in Logos!
Donnie