1. and Fundamentals of Clinical Trials, 2nd edn, DSG Publishing Co. Inc., 1985.
2. Interim analysis in clinical trials
3. Interim Analyses in Randomized Clinical Trials: Ramifications and Guidelines for Practitioners
4. ‘Multiple looks and interim analyses from a drug sponsor's point of view’, presented at International Statistical Institute 48th Session, Cairo, Egypt, 15 September, 1991.
5. and ‘Interim analyses in clinical trials’, to appear in and (eds.), Statistics in the Pharmaceutical Industry, 2nd edn, Marcel Dekker, New York, 1992.