Cita APA (7a ed.)
Graham, B. (1975). Angels: God's secret agents. Doubleday.
Cita Chicago Style (17a ed.)
Graham, Billy. Angels: God's Secret Agents. Garden City, N.Y.: Doubleday, 1975.
Cita MLA (9a ed.)
Graham, Billy. Angels: God's Secret Agents. Doubleday, 1975.
Precaución: Estas citas no son 100% exactas.