Just for fun... Here are the five ministry books that have had the most influence on me (in no particular order)...
The Holiness of God - R.C. Sproul
Mere Christianity - C.S. Lewis
Evangelism and the Sovereignty of God - J.I. Packer
The Present Future - Reggie McNeal
Leading on Empty - Wayne Cordeiro
There are lots of other honorable mentions, but if pressed, these are the five I would choose. I am interested to hear from the rest of you... What five would you choose?