Mary C. Neal, M.D. (2012). “To Heaven and Back: A Doctor's Extraordinary Account of Her Death, Heaven, Angels, and Life Again: A True Story”, p.209, WaterBrook
Jonathan Edwards, David Brainerd (1830). “treatise concerning religious affections. Justification by faith alone. Pressing into the kingdom of God. Ruth's resolution. Justice of God in the damnation of sinners. The excellency of Jesus Christ”, p.152