Downs, R. B. (1956). Books that changed the world. American Library Association.
Citazione stile Chigago Style (17a edizione)Downs, Robert Bingham. Books That Changed the World. Chicago: American Library Association, 1956.
Citatione MLA (9a ed.)Downs, Robert Bingham. Books That Changed the World. American Library Association, 1956.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.