1. Historical statistics of the United States, colonial times to 1957; a Statistical abstract supplement. Washington: Government Printing Office;Martin Bronfenbrenner;Challenge,1957
2. Reprinted "I Discovered the Phillips Curve: A Statistical Relation between Unemployment and Price Changes;Irving Fisher;Journal of Political Economy,1926
3. Economists on Samuelson and Solow on the Phillips Curve;James Forder;Economics Series Working Papers,2010