Downs, R. (1983). Books that changed the world. New American.
Chicago-čujuhus (17. p.)Downs, Robert. Books That Changed the World. New York: New American, 1983.
MLA-čujuhus (9. p.)Downs, Robert. Books That Changed the World. New American, 1983.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.