Diebold, Francis X., and Glenn D. Rudebusch.Business Cycles: Duration, Dynamics, and Forecasting. Princeton University Press, 1999. Crucial reading for policy makers, business executives, and others who need to understand the fluctuations in the economy.
Hartley, James E.; Kevin D. Hoover; and Kevin D. Sayler.Real Business Cycles: A Reader. Routledge, 1998. A collection of articles that define and develop the real business cycle school.