King, Gary; Keohane, Robert O.; Verba, Sidney (1994). Designing Social Inquiry. Princeton: Princeton University Press. pp. 179–182. doi:10.1515/9781400821211. ISBN978-1-4008-2121-1.
Milner, Helen V. (1986). Resisting the protectionist temptation: industry politics and trade policy in France and the United States in the 1920s and 1970s (Ph.D thesis). Harvard University. OCLC25994297.