Heaven by Randy Alcorn
Alcorn dives deep into the doctrine of heaven and answers almost every question you could ask.
We Shall See God by Randy Alcorn
Here Alcorn goes to the sermons of the great Charles Spurgeon to provide powerful devotional thoughts on heaven.
Biblical Teaching on the Doctrines of Heaven and Hell by Edward Donnelly
Behind the uninspiring title is an excellent book on heaven and hell.
The Glory of Heaven by John MacArthur
MacArthur goes beyond the heaven tourism books to show what the Bible actually says about heaven.