L'Engle, M. (1980). A ring of endless light. Farrar, Straus, Giroux.
Cita Chicago Style (17a ed.)L'Engle, Madeleine. A Ring of Endless Light. New York: Farrar, Straus, Giroux, 1980.
Cita MLA (8a ed.)L'Engle, Madeleine. A Ring of Endless Light. Farrar, Straus, Giroux, 1980.
Precaución: Estas citas no son 100% exactas.