A Praying Life by Paul Miller.
Perhaps the greatest strength of this book is Miller’s unrelenting emphasis that prayer cannot be an add-on to the Christian life; it cannot be supplemental but must always be instrumental. This book will equip you to understand prayer properly and, on that firm foundation, to commit yourself to it, with confidence that God is willing and able to hear and answer your prayers.
Prayer by Tim Keller
This is a wonderful book that dives deep into the history of Christianity to find both a theology and practice of prayer.
Praying Backwards by Bryan Chapell
This book majors on praying in Jesus’ name and trusting the power of the Holy Spirit.
The Prayer of the Lord by R.C. Sproul
Sproul looks to The Lord’s Prayer and uses it as our model.
In Light of Eternity by Mack Tomlinson
Sometimes the best way to renew our love of prayer is to read about a Christian who loved to pray. Consider this biography of Leonard Ravenhill.
It Happens After Prayer by H.B. Charles
I really enjoyed this short, simple, practical book.
The Valley of Vision is a great collection of Puritan prayers.