"Lasciate ogne speranza, voi ch'intrate", or "Abandon all hope, ye who enter here" – John Ciardi (1977)

– Dante Alighieri Dante's Inferno

• Harold F Gosnell (1937). Machine Politics: Chicago Model. University of Chicago Press.
• Harold F Gosnell (2007). Boss Platt and His New York Machine: A Study of the Political Leadership of Thomas C. Platt, Theodore Roosevelt and Others. Lightning Source Inc. ISBN  1432588508. {{ cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) ( help)