Cita APA (7a ed.)
Hayes, D. (1977). Rays of hope: The transition to a post-petroleum world. Norton.
Cita Chicago Style (17a ed.)
Hayes, Denis. Rays of Hope: The Transition to a Post-petroleum World. New York: Norton, 1977.
Cita MLA (9a ed.)
Hayes, Denis. Rays of Hope: The Transition to a Post-petroleum World. Norton, 1977.
Precaución: Estas citas no son 100% exactas.