Tolong jelaskan mengenai Sumber dari Ruth Hanna McCormick dalam bahasa melayu

Hasara, Karen. "McCormick unsung heroine in U.S. politics." Illinois Issues. XIX. 7 (July 1993): 28.

Miller, Kristie. Ruth Hanna McCormick: A Life in Politics, 1880-1944. Albuquerque: University of New Mexico Press, 1992.

Miller, Kristie. "Ruth Hanna McCormick and the Senatorial Election of 1930." Illinois Historical Journal, 81 (Autumn 1988): 191-210.