Charles Hodge (1855). “What is Presbyterianism?: An Address Delivered Before the Presbyterian Historical Society at Their Anniversary Meeting in Philadelphia, on Tuesday Evening, May 1, 1855”, p.27
Chris Oyakhilome PhD (2013). “How to Pray Effectively: Volume One: Understanding the Rules of Prayer for Different Situations and How to Apply Them for Your Desired Outcome”, p.38, Lulu Press, Inc