As a follow up to last Sunday's sermon, here are some good resources on the doctrine of definite atonement, or, as Lee Gatiss calls it, the doctrine of "personal intentional effective atonement."
If you are new to the subject, a good place to start might be R. C. Sproul, The Truth of the Cross. Dr. Sproul provides an accessible overview of what Christ accomplished on the cross, and he also deals with the issue of definite atonement. If you want to go a bit more in depth you can read John Murray's standard, Redemption Accomplished and Applied.
Zeroing in on books that deal specifically with issue of the extent of the atonement, you should not avoid the weighty tome by John Owen, The Death of Death in the Death of Christ. On the other hand, I do not recommend that you start with this book unless you are used to seventeenth century theological writing.
Instead, I recommend that you pick up a copy of Lee Gatiss' For Us and For Our Salvation. It is brief (134 pp), clear, learned, and charitable.It is a great place to start.
But my favorite book on definite atonement is now From Heaven He Came and Sought Her, edited by David and Jonathan Gibson. It is a first-rate piece of work. It is clear and comprehensive. It made me rejoice anew in the power and glory of the cross.