How to Pray is a 130-page book by Reuben Archer Torrey, published in 1900 by Fleming Revell of New York. It was translated into many langauges.
In the preface to 1924's The Power of Prayer and the Prayer of Power, Torrey says he wrote How to Pray at the request of D. L. Moody, "and God used that book to stir many thousands to pray; and the great work in Australia and New Zealand in 1902, extending over to England, Scotland, Ireland, and Wales (the great Welsh revival in 1904) and to India and many lands, resulting int he conversion of hundreds of thousands of souls, was the direct outcome of the publication of that book."
Contents
Chapter I. The Importance of Prayer
Chapter II. Praying Unto God
Chapter III. Obeying and Praying
Chapter IV. Praying in the Name of Christ and According to the Will of God
Chapter V. Praying in the Spirit
Chapter VI. Always Praying and Not Fainting
Chapter VII. Abiding in Christ
Chapter VIII. Praying With Thanksgiving
Chapter IX. Hindrances to Prayer
Chapter X. When To Pray
Chapter XI. The Need of Prayer Before and During Revivals
Chapter XII. The Place of Prayer Before and During Revivals