Williams, Gerhard Mennen (1933). Social Significance of Henry Ford (Senior Theses). Princeton University. Archived from the original on June 4, 2020. Retrieved June 4, 2020.
Williams, Gerhard Mennen (1933). Social Significance of Henry Ford (Senior Theses). Princeton University. Archived from the original on June 4, 2020. Retrieved June 4, 2020.