Caplow، Theodore؛ Bahr، Howard M.؛ Chadwick، Bruce A.؛ Modell، John (1994). Recent Social Trends in the United States, 1960–1990. McGill-Queen's Press. ص. 337. ISBN:9780773512122. مؤرشف من الأصل في 2017-05-25. They add: "The Republican party, nationally, moved from right-center toward the center in 1940s and 1950s, then moved right again in the 1970s and 1980s.
Caplow، Theodore؛ Bahr، Howard M.؛ Chadwick، Bruce A.؛ Modell، John (1994). Recent Social Trends in the United States, 1960–1990. McGill-Queen's Press. ص. 337. ISBN:9780773512122. مؤرشف من الأصل في 2017-05-25. They add: "The Republican party, nationally, moved from right-center toward the center in 1940s and 1950s, then moved right again in the 1970s and 1980s.