1. Failed Cooperation in Heterogeneous Industries Under the National Recovery Administration;Barbara Alexander;The Journal of Economic History,1997
2. Board of Governors of the Federal Reserve System (US), Household Debt Service Payments as a Percent of Disposable Personal Income [TDSP], retrieved from FRED;Chart of the Day: Student Loans Have Grown 511% Since,1999
3. The Three Orders;Georges ; Duby;Form-99 Miscellaneous Filing, U.S. Federal Election Commission (FEC),1980