Dyfyniad APA
Piper, D., & Murphey, C. (2004). 90 minutes in heaven: A true story of death & life. Revell.
Dyfyniad Arddull Chicago
Piper, Don, and Cecil Murphey. 90 Minutes in Heaven: A True Story of Death & Life. Grand Rapids, Mich: Revell, 2004.
Dyfyniad MLA
Piper, Don, and Cecil Murphey. 90 Minutes in Heaven: A True Story of Death & Life. Revell, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.