Helfand, L. (2016). They changed the world. Campfire.
Cita Chicago Style (17a ed.)Helfand, Lewis. They Changed the World. New Delhi, India: Campfire, 2016.
Cita MLA (8a ed.)Helfand, Lewis. They Changed the World. Campfire, 2016.
Precaución: Estas citas no son 100% exactas.