1. 2000. The lead profile and other non-parametric tools to evaluate a survey series. In Use of Survey Data for Industry Research and Economic Policy, , (eds). Ashgate: Aldershot, UK.
2. 1990. A reassessment of composite indexes. In Analyzing Modern Business Cycles, (ed.). ME Sharpe: Armonk, NY.
3. 1971. Cyclical Analysis of Time Series: Selected Procedures and Computer Programs. National Bureau of Economic Research: New York.
4. 1946. Measuring Business Cycles. National Bureau of Economic Research: New York.