Talking to God in Prayer:

Watchman Nee. Let Us Pray. Christian Fellowship Publishers: New York. 1977.

A.W. Tozer. Prayer Changes People and Things. In: The Price of Neglect. WingSpread Publishers: Camp Hill, PA.  2010.

Warren W. Wiersbe.  Prayer 101.  Experiencing the Heart of God. David C. Cook: Colorado Springs, CO.  2016.