The 100 Year Prayer Meeting
John Gill on Prayer
B.B. Warfield
Supplying resource material for praying believers and their leaders on:
Prayer and The Prayer Meeting
Other Subjects:  The Attributes of God, The Death of Christ.
George Müller and Prayer

A congregation without a prayer meeting is essentially defective in its
organization, and so must be limited in its efficiency.
The Prayer Meeting and Its History, J. B. Johnston
Answers to Prayer from George Mueller's Narratives
George Mueller Of Bristol by A. T. Pierson
George Mueller a Short Biography