(页面存档备份,存于互联网档案馆) Gorn, Elliott J. The Manly Art–Bare-Knuckle Prize Fighting in America (1986) Griswold, Robert L. Fatherhood in America: A history (1993) Rotundo
development): John W. Hyatt 1872年: 加法器: Edmund D. Barbour 1873年: Railway knuckle coupler: Eli H. Janney 1873年: Modern direct current electric motor: Zénobe